diff --git a/tests/SIGCM2.Api.Tests/Admin/PuntosDeVentaControllerTests.cs b/tests/SIGCM2.Api.Tests/Admin/PuntosDeVentaControllerTests.cs
new file mode 100644
index 0000000..8e8b271
--- /dev/null
+++ b/tests/SIGCM2.Api.Tests/Admin/PuntosDeVentaControllerTests.cs
@@ -0,0 +1,876 @@
+using System.Net;
+using System.Net.Http.Headers;
+using System.Net.Http.Json;
+using System.Text.Json;
+using Dapper;
+using Microsoft.Data.SqlClient;
+using SIGCM2.TestSupport;
+
+namespace SIGCM2.Api.Tests.Admin;
+
+/// <summary>
+/// ADM-008 B5 — Integration tests for /api/v1/admin/puntos-de-venta.
+/// All endpoints require permission 'administracion:puntos_de_venta:gestionar'.
+/// Tests: T5.3 CRUD, T5.4 concurrencia, T5.5 secuencialidad.
+/// </summary>
+[Collection("ApiIntegration")]
+public sealed class PuntosDeVentaControllerTests : IAsyncLifetime
+{
+    private const string TestConnectionString =
+        "Server=TECNICA3;Database=SIGCM2_Test;User Id=desarrollo;Password=desarrollo2026;TrustServerCertificate=True;";
+
+    private const string Endpoint = "/api/v1/admin/puntos-de-venta";
+    private const string MediosEndpoint = "/api/v1/admin/medios";
+    private const string AdminUsername = "admin";
+    private const string AdminPassword = "@Diego550@";
+
+    private readonly HttpClient _client;
+
+    public PuntosDeVentaControllerTests(TestWebAppFactory factory)
+    {
+        _client = factory.CreateClient();
+    }
+
+    public Task InitializeAsync() => Task.CompletedTask;
+    public Task DisposeAsync() => Task.CompletedTask;
+
+    // ── Helpers ──────────────────────────────────────────────────────────────
+
+    private async Task<string> GetAdminTokenAsync()
+    {
+        var response = await _client.PostAsJsonAsync("/api/v1/auth/login", new
+        {
+            username = AdminUsername,
+            password = AdminPassword
+        });
+        response.EnsureSuccessStatusCode();
+        var json = await response.Content.ReadFromJsonAsync<JsonElement>();
+        return json.GetProperty("accessToken").GetString()!;
+    }
+
+    private async Task<string> GetCajeroTokenAsync(string username)
+    {
+        var adminToken = await GetAdminTokenAsync();
+
+        using var mkUser = BuildRequest(HttpMethod.Post, "/api/v1/users", new
+        {
+            username,
+            password = "Secure1234!",
+            nombre = "Cajero",
+            apellido = "Test",
+            email = (string?)null,
+            rol = "cajero"
+        }, adminToken);
+        var mkResp = await _client.SendAsync(mkUser);
+        if (mkResp.StatusCode != HttpStatusCode.Created && mkResp.StatusCode != HttpStatusCode.Conflict)
+            Assert.Fail($"Seed cajero failed: {mkResp.StatusCode}");
+
+        var loginResp = await _client.PostAsJsonAsync("/api/v1/auth/login", new
+        {
+            username,
+            password = "Secure1234!"
+        });
+        loginResp.EnsureSuccessStatusCode();
+        var loginJson = await loginResp.Content.ReadFromJsonAsync<JsonElement>();
+        return loginJson.GetProperty("accessToken").GetString()!;
+    }
+
+    private HttpRequestMessage BuildRequest(HttpMethod method, string url, object? body = null, string? bearerToken = null)
+    {
+        var request = new HttpRequestMessage(method, url);
+        if (bearerToken is not null)
+            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", bearerToken);
+        if (body is not null)
+            request.Content = JsonContent.Create(body);
+        return request;
+    }
+
+    /// <summary>Creates a Medio via the API and returns its id.</summary>
+    private async Task<int> CreateMedioAsync(string codigo, string nombre, string token)
+    {
+        using var req = BuildRequest(HttpMethod.Post, MediosEndpoint, new
+        {
+            codigo,
+            nombre,
+            tipo = 1
+        }, token);
+        var resp = await _client.SendAsync(req);
+        resp.EnsureSuccessStatusCode();
+        var json = await resp.Content.ReadFromJsonAsync<JsonElement>();
+        return json.GetProperty("id").GetInt32();
+    }
+
+    /// <summary>Creates a PuntoDeVenta via the API and returns its id.</summary>
+    private async Task<int> CreatePdvAsync(int medioId, short numeroAFIP, string nombre, string token)
+    {
+        using var req = BuildRequest(HttpMethod.Post, Endpoint, new
+        {
+            medioId,
+            numeroAFIP,
+            nombre,
+            descripcion = (string?)null
+        }, token);
+        var resp = await _client.SendAsync(req);
+        resp.EnsureSuccessStatusCode();
+        var json = await resp.Content.ReadFromJsonAsync<JsonElement>();
+        return json.GetProperty("id").GetInt32();
+    }
+
+    private static async Task DeleteMedioIfExistsAsync(string codigo)
+    {
+        await using var conn = new SqlConnection(TestConnectionString);
+        await conn.OpenAsync();
+
+        var id = await conn.QuerySingleOrDefaultAsync<int?>(
+            "SELECT Id FROM dbo.Medio WHERE Codigo = @Codigo", new { Codigo = codigo });
+        if (id is null) return;
+
+        // Delete SecuenciaComprobante for PuntosDeVenta of this Medio (no versioning)
+        await conn.ExecuteAsync("""
+            DELETE sc FROM dbo.SecuenciaComprobante sc
+            INNER JOIN dbo.PuntoDeVenta pdv ON pdv.Id = sc.PuntoDeVentaId
+            WHERE pdv.MedioId = @id
+            """, new { id });
+
+        // Delete dependent PuntosDeVenta (disable versioning to also clear history)
+        await conn.ExecuteAsync("ALTER TABLE dbo.PuntoDeVenta SET (SYSTEM_VERSIONING = OFF)");
+        await conn.ExecuteAsync("DELETE FROM dbo.PuntoDeVenta_History WHERE MedioId = @id", new { id });
+        await conn.ExecuteAsync("DELETE FROM dbo.PuntoDeVenta WHERE MedioId = @id", new { id });
+        await conn.ExecuteAsync(
+            "ALTER TABLE dbo.PuntoDeVenta SET (SYSTEM_VERSIONING = ON (HISTORY_TABLE = dbo.PuntoDeVenta_History, HISTORY_RETENTION_PERIOD = 10 YEARS))");
+
+        // Delete dependent Secciones
+        await conn.ExecuteAsync("ALTER TABLE dbo.Seccion SET (SYSTEM_VERSIONING = OFF)");
+        await conn.ExecuteAsync("DELETE FROM dbo.Seccion_History WHERE MedioId = @id", new { id });
+        await conn.ExecuteAsync("DELETE FROM dbo.Seccion WHERE MedioId = @id", new { id });
+        await conn.ExecuteAsync(
+            "ALTER TABLE dbo.Seccion SET (SYSTEM_VERSIONING = ON (HISTORY_TABLE = dbo.Seccion_History, HISTORY_RETENTION_PERIOD = 10 YEARS))");
+
+        // Delete the medio itself
+        await conn.ExecuteAsync("ALTER TABLE dbo.Medio SET (SYSTEM_VERSIONING = OFF)");
+        await conn.ExecuteAsync("DELETE FROM dbo.Medio_History WHERE Id = @id", new { id });
+        await conn.ExecuteAsync("DELETE FROM dbo.Medio WHERE Id = @id", new { id });
+        await conn.ExecuteAsync(
+            "ALTER TABLE dbo.Medio SET (SYSTEM_VERSIONING = ON (HISTORY_TABLE = dbo.Medio_History, HISTORY_RETENTION_PERIOD = 10 YEARS))");
+    }
+
+    private static async Task DeleteUsuarioIfExistsAsync(string username)
+    {
+        await using var conn = new SqlConnection(TestConnectionString);
+        await conn.OpenAsync();
+        await conn.ExecuteAsync("""
+            DELETE rt FROM dbo.RefreshToken rt
+            INNER JOIN dbo.Usuario u ON u.Id = rt.UsuarioId
+            WHERE u.Username = @Username
+            """, new { Username = username });
+        await conn.ExecuteAsync("DELETE FROM dbo.Usuario WHERE Username = @Username", new { Username = username });
+    }
+
+    private static async Task<int> CountAuditEventsAsync(string action, string targetType, string targetId)
+    {
+        await using var conn = new SqlConnection(TestConnectionString);
+        await conn.OpenAsync();
+        return await conn.QuerySingleAsync<int>(
+            "SELECT COUNT(*) FROM dbo.AuditEvent WHERE Action = @Action AND TargetType = @TargetType AND TargetId = @TargetId",
+            new { Action = action, TargetType = targetType, TargetId = targetId });
+    }
+
+    // ── 401 / 403 guards ─────────────────────────────────────────────────────
+
+    [Fact]
+    public async Task CreatePdv_WithoutAuth_Returns401()
+    {
+        using var req = BuildRequest(HttpMethod.Post, Endpoint, new
+        {
+            medioId = 1,
+            numeroAFIP = 1,
+            nombre = "PdV Test"
+        });
+        var resp = await _client.SendAsync(req);
+        Assert.Equal(HttpStatusCode.Unauthorized, resp.StatusCode);
+    }
+
+    [Fact]
+    public async Task CreatePdv_WithCajeroRole_Returns403()
+    {
+        const string username = "adm008_pdv_cajero_403";
+        try
+        {
+            var token = await GetCajeroTokenAsync(username);
+            using var req = BuildRequest(HttpMethod.Post, Endpoint, new
+            {
+                medioId = 1,
+                numeroAFIP = 1,
+                nombre = "PdV Test 403"
+            }, token);
+            var resp = await _client.SendAsync(req);
+            Assert.Equal(HttpStatusCode.Forbidden, resp.StatusCode);
+        }
+        finally
+        {
+            await DeleteUsuarioIfExistsAsync(username);
+        }
+    }
+
+    // ── CREATE ────────────────────────────────────────────────────────────────
+
+    /// <summary>T5.3 — Happy path: Create returns 201 + AuditEvent.</summary>
+    [Fact]
+    public async Task CreatePdv_WithAdmin_Returns201AndAuditEvent()
+    {
+        const string medioCodigo = "ADMS08_MED_C201";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio PDV Create 201", token);
+
+            using var req = BuildRequest(HttpMethod.Post, Endpoint, new
+            {
+                medioId,
+                numeroAFIP = (short)1,
+                nombre = "PdV Central Create",
+                descripcion = "Test desc"
+            }, token);
+            var resp = await _client.SendAsync(req);
+
+            Assert.Equal(HttpStatusCode.Created, resp.StatusCode);
+            Assert.NotNull(resp.Headers.Location);
+
+            var json = await resp.Content.ReadFromJsonAsync<JsonElement>();
+            Assert.True(json.TryGetProperty("id", out var idEl));
+            var pdvId = idEl.GetInt32();
+            Assert.True(pdvId > 0);
+            Assert.Equal(medioId, json.GetProperty("medioId").GetInt32());
+            Assert.Equal(1, json.GetProperty("numeroAFIP").GetInt16());
+            Assert.Equal("PdV Central Create", json.GetProperty("nombre").GetString());
+            Assert.True(json.GetProperty("activo").GetBoolean());
+
+            var auditCount = await CountAuditEventsAsync("punto_de_venta.create", "PuntoDeVenta", pdvId.ToString());
+            Assert.Equal(1, auditCount);
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+
+    /// <summary>T5.3 — 409 medio_inactivo al crear con Medio inactivo.</summary>
+    [Fact]
+    public async Task CreatePdv_WithInactiveMedio_Returns409MedioInactivo()
+    {
+        const string medioCodigo = "ADMS08_MED_INACT";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio Inactivo PDV", token);
+
+            // Deactivate the medio
+            using var deactReq = BuildRequest(HttpMethod.Post, $"{MediosEndpoint}/{medioId}/deactivate", bearerToken: token);
+            var deactResp = await _client.SendAsync(deactReq);
+            Assert.Equal(HttpStatusCode.NoContent, deactResp.StatusCode);
+
+            // Try to create PdV in inactive medio
+            using var req = BuildRequest(HttpMethod.Post, Endpoint, new
+            {
+                medioId,
+                numeroAFIP = (short)1,
+                nombre = "PdV en Medio Inactivo"
+            }, token);
+            var resp = await _client.SendAsync(req);
+
+            Assert.Equal(HttpStatusCode.Conflict, resp.StatusCode);
+            var json = await resp.Content.ReadFromJsonAsync<JsonElement>();
+            Assert.Equal("medio_inactivo", json.GetProperty("error").GetString());
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+
+    /// <summary>T5.3 — 409 numero_afip_duplicado al violar UNIQUE(MedioId, NumeroAFIP).</summary>
+    [Fact]
+    public async Task CreatePdv_DuplicateNumeroAFIPInSameMedio_Returns409()
+    {
+        const string medioCodigo = "ADMS08_MED_DUP";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio PDV Dup", token);
+
+            // First create
+            using var first = BuildRequest(HttpMethod.Post, Endpoint, new
+            {
+                medioId,
+                numeroAFIP = (short)1,
+                nombre = "PdV Original"
+            }, token);
+            var firstResp = await _client.SendAsync(first);
+            Assert.Equal(HttpStatusCode.Created, firstResp.StatusCode);
+
+            // Second with same medioId + numeroAFIP
+            using var second = BuildRequest(HttpMethod.Post, Endpoint, new
+            {
+                medioId,
+                numeroAFIP = (short)1,
+                nombre = "PdV Duplicado"
+            }, token);
+            var secondResp = await _client.SendAsync(second);
+
+            Assert.Equal(HttpStatusCode.Conflict, secondResp.StatusCode);
+            var json = await secondResp.Content.ReadFromJsonAsync<JsonElement>();
+            Assert.Equal("numero_afip_duplicado", json.GetProperty("error").GetString());
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+
+    /// <summary>T5.3 — mismo NumeroAFIP en distinto Medio es permitido.</summary>
+    [Fact]
+    public async Task CreatePdv_SameNumeroAFIPDifferentMedio_Returns201()
+    {
+        const string medio1Codigo = "ADMS08_M1_MULTI";
+        const string medio2Codigo = "ADMS08_M2_MULTI";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId1 = await CreateMedioAsync(medio1Codigo, "Medio Multi 1 PDV", token);
+            var medioId2 = await CreateMedioAsync(medio2Codigo, "Medio Multi 2 PDV", token);
+
+            using var req1 = BuildRequest(HttpMethod.Post, Endpoint, new
+            {
+                medioId = medioId1,
+                numeroAFIP = (short)1,
+                nombre = "PdV Medio 1"
+            }, token);
+            var resp1 = await _client.SendAsync(req1);
+            Assert.Equal(HttpStatusCode.Created, resp1.StatusCode);
+
+            // Same numeroAFIP in different medio → should succeed
+            using var req2 = BuildRequest(HttpMethod.Post, Endpoint, new
+            {
+                medioId = medioId2,
+                numeroAFIP = (short)1,
+                nombre = "PdV Medio 2"
+            }, token);
+            var resp2 = await _client.SendAsync(req2);
+            Assert.Equal(HttpStatusCode.Created, resp2.StatusCode);
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medio1Codigo);
+            await DeleteMedioIfExistsAsync(medio2Codigo);
+        }
+    }
+
+    // ── GET BY ID ────────────────────────────────────────────────────────────
+
+    /// <summary>T5.3 — 404 cuando id inexistente.</summary>
+    [Fact]
+    public async Task GetPdvById_NotFound_Returns404()
+    {
+        var token = await GetAdminTokenAsync();
+        using var req = BuildRequest(HttpMethod.Get, $"{Endpoint}/999999", bearerToken: token);
+        var resp = await _client.SendAsync(req);
+
+        Assert.Equal(HttpStatusCode.NotFound, resp.StatusCode);
+        var json = await resp.Content.ReadFromJsonAsync<JsonElement>();
+        Assert.Equal("punto_de_venta_not_found", json.GetProperty("error").GetString());
+    }
+
+    // ── LIST ─────────────────────────────────────────────────────────────────
+
+    /// <summary>T5.3 — List returns 200 with paged result.</summary>
+    [Fact]
+    public async Task ListPdvs_WithAdmin_Returns200PagedResult()
+    {
+        var token = await GetAdminTokenAsync();
+        using var req = BuildRequest(HttpMethod.Get, Endpoint, bearerToken: token);
+        var resp = await _client.SendAsync(req);
+
+        Assert.Equal(HttpStatusCode.OK, resp.StatusCode);
+        var json = await resp.Content.ReadFromJsonAsync<JsonElement>();
+        Assert.True(json.TryGetProperty("items", out _), "Response must have 'items'");
+        Assert.True(json.TryGetProperty("total", out _), "Response must have 'total'");
+    }
+
+    /// <summary>T5.3 — List filtrado por medioId y activo.</summary>
+    [Fact]
+    public async Task ListPdvs_FilterByMedioAndActivo_ReturnsMatchingItems()
+    {
+        const string medioCodigo = "ADMS08_MED_LIST";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio PDV List", token);
+            await CreatePdvAsync(medioId, 1, "PdV Lista 1", token);
+            await CreatePdvAsync(medioId, 2, "PdV Lista 2", token);
+
+            // Filter by medioId
+            using var req = BuildRequest(HttpMethod.Get, $"{Endpoint}?medioId={medioId}&activo=true", bearerToken: token);
+            var resp = await _client.SendAsync(req);
+
+            Assert.Equal(HttpStatusCode.OK, resp.StatusCode);
+            var json = await resp.Content.ReadFromJsonAsync<JsonElement>();
+            var items = json.GetProperty("items").EnumerateArray().ToList();
+            Assert.Equal(2, items.Count);
+            Assert.All(items, item => Assert.Equal(medioId, item.GetProperty("medioId").GetInt32()));
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+
+    // ── UPDATE ────────────────────────────────────────────────────────────────
+
+    /// <summary>T5.3 — Happy path Update returns 200 + AuditEvent.</summary>
+    [Fact]
+    public async Task UpdatePdv_WithAdmin_Returns200AndAuditEvent()
+    {
+        const string medioCodigo = "ADMS08_MED_UPD";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio PDV Update", token);
+            var pdvId = await CreatePdvAsync(medioId, 1, "PdV Original", token);
+
+            using var updateReq = BuildRequest(HttpMethod.Put, $"{Endpoint}/{pdvId}", new
+            {
+                nombre = "PdV Actualizado",
+                numeroAFIP = (short)2,
+                descripcion = "Nueva desc"
+            }, token);
+            var updateResp = await _client.SendAsync(updateReq);
+
+            Assert.Equal(HttpStatusCode.OK, updateResp.StatusCode);
+            var updated = await updateResp.Content.ReadFromJsonAsync<JsonElement>();
+            Assert.Equal("PdV Actualizado", updated.GetProperty("nombre").GetString());
+            Assert.Equal(2, updated.GetProperty("numeroAFIP").GetInt16());
+
+            var auditCount = await CountAuditEventsAsync("punto_de_venta.update", "PuntoDeVenta", pdvId.ToString());
+            Assert.Equal(1, auditCount);
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+
+    /// <summary>T5.3 — 409 punto_de_venta_inactivo al actualizar PdV inactivo.</summary>
+    [Fact]
+    public async Task UpdatePdv_WhenPdvInactive_Returns409PdvInactivo()
+    {
+        const string medioCodigo = "ADMS08_MED_UPDI";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio PDV Update Inactivo", token);
+            var pdvId = await CreatePdvAsync(medioId, 1, "PdV Para Inactivar", token);
+
+            // Deactivate the PdV
+            using var deactReq = BuildRequest(HttpMethod.Post, $"{Endpoint}/{pdvId}/deactivate", bearerToken: token);
+            var deactResp = await _client.SendAsync(deactReq);
+            Assert.Equal(HttpStatusCode.NoContent, deactResp.StatusCode);
+
+            // Try to update inactive PdV
+            using var updateReq = BuildRequest(HttpMethod.Put, $"{Endpoint}/{pdvId}", new
+            {
+                nombre = "PdV Inactivo Update",
+                numeroAFIP = (short)1
+            }, token);
+            var updateResp = await _client.SendAsync(updateReq);
+
+            Assert.Equal(HttpStatusCode.Conflict, updateResp.StatusCode);
+            var json = await updateResp.Content.ReadFromJsonAsync<JsonElement>();
+            Assert.Equal("punto_de_venta_inactivo", json.GetProperty("error").GetString());
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+
+    /// <summary>T5.3 — 409 medio_inactivo al actualizar PdV con Medio inactivo.</summary>
+    [Fact]
+    public async Task UpdatePdv_WhenMedioInactive_Returns409MedioInactivo()
+    {
+        const string medioCodigo = "ADMS08_MED_UPDMI";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio PDV Update MedioInact", token);
+            var pdvId = await CreatePdvAsync(medioId, 1, "PdV Update Medio Inactivo", token);
+
+            // Deactivate the medio
+            using var deactMedioReq = BuildRequest(HttpMethod.Post, $"{MediosEndpoint}/{medioId}/deactivate", bearerToken: token);
+            var deactMedioResp = await _client.SendAsync(deactMedioReq);
+            Assert.Equal(HttpStatusCode.NoContent, deactMedioResp.StatusCode);
+
+            // Try to update PdV with inactive medio
+            using var updateReq = BuildRequest(HttpMethod.Put, $"{Endpoint}/{pdvId}", new
+            {
+                nombre = "PdV Medio Inactivo",
+                numeroAFIP = (short)1
+            }, token);
+            var updateResp = await _client.SendAsync(updateReq);
+
+            Assert.Equal(HttpStatusCode.Conflict, updateResp.StatusCode);
+            var json = await updateResp.Content.ReadFromJsonAsync<JsonElement>();
+            Assert.Equal("medio_inactivo", json.GetProperty("error").GetString());
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+
+    // ── DEACTIVATE ────────────────────────────────────────────────────────────
+
+    /// <summary>T5.3 — Happy path Deactivate returns 204 + AuditEvent.</summary>
+    [Fact]
+    public async Task DeactivatePdv_WithAdmin_Returns204AndAuditEvent()
+    {
+        const string medioCodigo = "ADMS08_MED_DEACT";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio PDV Deactivate", token);
+            var pdvId = await CreatePdvAsync(medioId, 1, "PdV Para Desactivar", token);
+
+            using var deactReq = BuildRequest(HttpMethod.Post, $"{Endpoint}/{pdvId}/deactivate", bearerToken: token);
+            var deactResp = await _client.SendAsync(deactReq);
+
+            Assert.Equal(HttpStatusCode.NoContent, deactResp.StatusCode);
+
+            var auditCount = await CountAuditEventsAsync("punto_de_venta.deactivate", "PuntoDeVenta", pdvId.ToString());
+            Assert.Equal(1, auditCount);
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+
+    // ── REACTIVATE ────────────────────────────────────────────────────────────
+
+    /// <summary>T5.3 — Happy path Reactivate returns 204 + AuditEvent.</summary>
+    [Fact]
+    public async Task ReactivatePdv_WithAdmin_Returns204AndAuditEvent()
+    {
+        const string medioCodigo = "ADMS08_MED_REACT";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio PDV Reactivate", token);
+            var pdvId = await CreatePdvAsync(medioId, 1, "PdV Para Reactivar", token);
+
+            // Deactivate first
+            using var deactReq = BuildRequest(HttpMethod.Post, $"{Endpoint}/{pdvId}/deactivate", bearerToken: token);
+            var deactResp = await _client.SendAsync(deactReq);
+            Assert.Equal(HttpStatusCode.NoContent, deactResp.StatusCode);
+
+            // Reactivate
+            using var reactReq = BuildRequest(HttpMethod.Post, $"{Endpoint}/{pdvId}/reactivate", bearerToken: token);
+            var reactResp = await _client.SendAsync(reactReq);
+
+            Assert.Equal(HttpStatusCode.NoContent, reactResp.StatusCode);
+
+            var auditCount = await CountAuditEventsAsync("punto_de_venta.reactivate", "PuntoDeVenta", pdvId.ToString());
+            Assert.Equal(1, auditCount);
+
+            // Verify it's active again via GET
+            using var getReq = BuildRequest(HttpMethod.Get, $"{Endpoint}/{pdvId}", bearerToken: token);
+            var getResp = await _client.SendAsync(getReq);
+            Assert.Equal(HttpStatusCode.OK, getResp.StatusCode);
+            var pdvJson = await getResp.Content.ReadFromJsonAsync<JsonElement>();
+            Assert.True(pdvJson.GetProperty("activo").GetBoolean());
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+
+    /// <summary>T5.3 — 409 medio_inactivo al reactivar con Medio inactivo.</summary>
+    [Fact]
+    public async Task ReactivatePdv_WhenMedioInactive_Returns409MedioInactivo()
+    {
+        const string medioCodigo = "ADMS08_MED_REACTMI";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio PDV Reactivate Inactivo", token);
+            var pdvId = await CreatePdvAsync(medioId, 1, "PdV Reactivate Medio Inactivo", token);
+
+            // Deactivate PdV while medio is active
+            using var deactPdvReq = BuildRequest(HttpMethod.Post, $"{Endpoint}/{pdvId}/deactivate", bearerToken: token);
+            await _client.SendAsync(deactPdvReq);
+
+            // Deactivate medio
+            using var deactMedioReq = BuildRequest(HttpMethod.Post, $"{MediosEndpoint}/{medioId}/deactivate", bearerToken: token);
+            var deactMedioResp = await _client.SendAsync(deactMedioReq);
+            Assert.Equal(HttpStatusCode.NoContent, deactMedioResp.StatusCode);
+
+            // Try to reactivate PdV with inactive medio
+            using var reactReq = BuildRequest(HttpMethod.Post, $"{Endpoint}/{pdvId}/reactivate", bearerToken: token);
+            var reactResp = await _client.SendAsync(reactReq);
+
+            Assert.Equal(HttpStatusCode.Conflict, reactResp.StatusCode);
+            var json = await reactResp.Content.ReadFromJsonAsync<JsonElement>();
+            Assert.Equal("medio_inactivo", json.GetProperty("error").GetString());
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+
+    // ── SECUENCIAS: RESERVAR ──────────────────────────────────────────────────
+
+    /// <summary>T5.3 — Primera reserva inicializa en 1.</summary>
+    [Fact]
+    public async Task ReservarNumero_FirstReservation_Returns1()
+    {
+        const string medioCodigo = "ADMS08_MED_RSV1";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio PDV Reservar 1", token);
+            var pdvId = await CreatePdvAsync(medioId, 1, "PdV Reservar First", token);
+
+            using var req = BuildRequest(HttpMethod.Post, $"{Endpoint}/{pdvId}/secuencias/FacturaA/reservar", bearerToken: token);
+            var resp = await _client.SendAsync(req);
+
+            Assert.Equal(HttpStatusCode.OK, resp.StatusCode);
+            var json = await resp.Content.ReadFromJsonAsync<JsonElement>();
+            Assert.Equal(1, json.GetProperty("numeroReservado").GetInt32());
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+
+    /// <summary>T5.3 — 409 punto_de_venta_inactivo al reservar en PdV inactivo.</summary>
+    [Fact]
+    public async Task ReservarNumero_WhenPdvInactive_Returns409PdvInactivo()
+    {
+        const string medioCodigo = "ADMS08_MED_RSVI";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio PDV Reservar Inactivo", token);
+            var pdvId = await CreatePdvAsync(medioId, 1, "PdV Reservar Inactivo", token);
+
+            // Deactivate PdV
+            using var deactReq = BuildRequest(HttpMethod.Post, $"{Endpoint}/{pdvId}/deactivate", bearerToken: token);
+            await _client.SendAsync(deactReq);
+
+            using var req = BuildRequest(HttpMethod.Post, $"{Endpoint}/{pdvId}/secuencias/FacturaA/reservar", bearerToken: token);
+            var resp = await _client.SendAsync(req);
+
+            Assert.Equal(HttpStatusCode.Conflict, resp.StatusCode);
+            var json = await resp.Content.ReadFromJsonAsync<JsonElement>();
+            Assert.Equal("punto_de_venta_inactivo", json.GetProperty("error").GetString());
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+
+    /// <summary>T5.3 — 409 medio_inactivo al reservar con Medio inactivo.</summary>
+    [Fact]
+    public async Task ReservarNumero_WhenMedioInactive_Returns409MedioInactivo()
+    {
+        const string medioCodigo = "ADMS08_MED_RSVMI";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio PDV Reservar MedioInactivo", token);
+            var pdvId = await CreatePdvAsync(medioId, 1, "PdV Reservar MedioInact", token);
+
+            // Deactivate medio
+            using var deactMedioReq = BuildRequest(HttpMethod.Post, $"{MediosEndpoint}/{medioId}/deactivate", bearerToken: token);
+            await _client.SendAsync(deactMedioReq);
+
+            using var req = BuildRequest(HttpMethod.Post, $"{Endpoint}/{pdvId}/secuencias/FacturaA/reservar", bearerToken: token);
+            var resp = await _client.SendAsync(req);
+
+            Assert.Equal(HttpStatusCode.Conflict, resp.StatusCode);
+            var json = await resp.Content.ReadFromJsonAsync<JsonElement>();
+            Assert.Equal("medio_inactivo", json.GetProperty("error").GetString());
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+
+    // ── SECUENCIAS: PROXIMO ───────────────────────────────────────────────────
+
+    /// <summary>T5.3 — GetProximo es read-only: no modifica UltimoNumero.</summary>
+    [Fact]
+    public async Task GetProximoNumero_DoesNotChangeState()
+    {
+        const string medioCodigo = "ADMS08_MED_PROX";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio PDV Proximo", token);
+            var pdvId = await CreatePdvAsync(medioId, 1, "PdV Proximo", token);
+
+            // Reserve once to establish state
+            using var rsv = BuildRequest(HttpMethod.Post, $"{Endpoint}/{pdvId}/secuencias/FacturaA/reservar", bearerToken: token);
+            await _client.SendAsync(rsv);
+
+            // GetProximo twice — should return 2 both times
+            using var req1 = BuildRequest(HttpMethod.Get, $"{Endpoint}/{pdvId}/secuencias/FacturaA/proximo", bearerToken: token);
+            var resp1 = await _client.SendAsync(req1);
+            Assert.Equal(HttpStatusCode.OK, resp1.StatusCode);
+            var json1 = await resp1.Content.ReadFromJsonAsync<JsonElement>();
+            Assert.Equal(2, json1.GetProperty("proximoNumero").GetInt32());
+
+            using var req2 = BuildRequest(HttpMethod.Get, $"{Endpoint}/{pdvId}/secuencias/FacturaA/proximo", bearerToken: token);
+            var resp2 = await _client.SendAsync(req2);
+            var json2 = await resp2.Content.ReadFromJsonAsync<JsonElement>();
+            Assert.Equal(2, json2.GetProperty("proximoNumero").GetInt32());
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+
+    /// <summary>T5.3 — GetProximo para fila inexistente devuelve 1.</summary>
+    [Fact]
+    public async Task GetProximoNumero_WhenNoSequenceExists_Returns1()
+    {
+        const string medioCodigo = "ADMS08_MED_PROX1";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio PDV Proximo 1", token);
+            var pdvId = await CreatePdvAsync(medioId, 1, "PdV Proximo First", token);
+
+            using var req = BuildRequest(HttpMethod.Get, $"{Endpoint}/{pdvId}/secuencias/FacturaB/proximo", bearerToken: token);
+            var resp = await _client.SendAsync(req);
+
+            Assert.Equal(HttpStatusCode.OK, resp.StatusCode);
+            var json = await resp.Content.ReadFromJsonAsync<JsonElement>();
+            Assert.Equal(1, json.GetProperty("proximoNumero").GetInt32());
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+
+    // ── T5.4 — Concurrencia ───────────────────────────────────────────────────
+
+    /// <summary>
+    /// T5.4 — 50 tasks paralelas reservando para mismo PdV + TipoComprobante
+    /// deben producir 50 números distintos cubriendo {1..50}.
+    /// </summary>
+    [Fact]
+    public async Task ReservarNumero_50ConcurrentReservations_ProducesNoDuplicates()
+    {
+        const string medioCodigo = "ADMS08_CONC50";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio PDV Concurrencia 50", token);
+            var pdvId = await CreatePdvAsync(medioId, 1, "PdV Concurrencia 50", token);
+
+            const int taskCount = 50;
+            var tasks = Enumerable.Range(0, taskCount)
+                .Select(_ => Task.Run(async () =>
+                {
+                    // Each task creates its own HttpClient to avoid sharing
+                    // the shared _client which is not thread-safe for concurrent requests.
+                    // Use BuildRequest on a shared client IS safe since HttpClient is thread-safe
+                    // for concurrent operations as long as each message is distinct.
+                    using var req = new HttpRequestMessage(HttpMethod.Post, $"{Endpoint}/{pdvId}/secuencias/FacturaA/reservar");
+                    req.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token);
+                    var resp = await _client.SendAsync(req);
+                    resp.EnsureSuccessStatusCode();
+                    var json = await resp.Content.ReadFromJsonAsync<JsonElement>();
+                    return json.GetProperty("numeroReservado").GetInt32();
+                }))
+                .ToList();
+
+            var results = await Task.WhenAll(tasks);
+
+            // All 50 numbers must be present exactly once
+            Assert.Equal(taskCount, results.Length);
+            Assert.Equal(taskCount, results.Distinct().Count());
+
+            var expected = Enumerable.Range(1, taskCount).ToHashSet();
+            var actual = results.ToHashSet();
+            Assert.Equal(expected, actual);
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+
+    // ── T5.5 — Secuencialidad ─────────────────────────────────────────────────
+
+    /// <summary>
+    /// T5.5 — 100 reservas en serie para mismo PdV + TipoComprobante
+    /// deben devolver {1, 2, 3, ..., 100} en orden.
+    /// </summary>
+    [Fact]
+    public async Task ReservarNumero_100SerialReservations_ProducesSequentialNumbers()
+    {
+        const string medioCodigo = "ADMS08_SEQ100";
+        var token = await GetAdminTokenAsync();
+
+        try
+        {
+            var medioId = await CreateMedioAsync(medioCodigo, "Medio PDV Secuencial 100", token);
+            var pdvId = await CreatePdvAsync(medioId, 1, "PdV Secuencial 100", token);
+
+            const int count = 100;
+            var results = new List<int>(count);
+
+            for (int i = 0; i < count; i++)
+            {
+                using var req = BuildRequest(HttpMethod.Post, $"{Endpoint}/{pdvId}/secuencias/FacturaA/reservar", bearerToken: token);
+                var resp = await _client.SendAsync(req);
+                resp.EnsureSuccessStatusCode();
+                var json = await resp.Content.ReadFromJsonAsync<JsonElement>();
+                results.Add(json.GetProperty("numeroReservado").GetInt32());
+            }
+
+            // Verify sequential: {1, 2, 3, ..., 100}
+            var expected = Enumerable.Range(1, count).ToList();
+            Assert.Equal(expected, results);
+        }
+        finally
+        {
+            await DeleteMedioIfExistsAsync(medioCodigo);
+        }
+    }
+}