diff --git a/src/api/SIGCM2.Api/Controllers/ChargeableCharConfigController.cs b/src/api/SIGCM2.Api/Controllers/ChargeableCharConfigController.cs
new file mode 100644
index 0000000..7bd1adc
--- /dev/null
+++ b/src/api/SIGCM2.Api/Controllers/ChargeableCharConfigController.cs
@@ -0,0 +1,201 @@
+using FluentValidation;
+using Microsoft.AspNetCore.Mvc;
+using SIGCM2.Api.Authorization;
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Common;
+using SIGCM2.Application.Pricing.ChargeableChars;
+using SIGCM2.Application.Pricing.ChargeableChars.Create;
+using SIGCM2.Application.Pricing.ChargeableChars.Deactivate;
+using SIGCM2.Application.Pricing.ChargeableChars.GetById;
+using SIGCM2.Application.Pricing.ChargeableChars.List;
+using SIGCM2.Application.Pricing.ChargeableChars.SchedulePrice;
+
+namespace SIGCM2.Api.Controllers;
+
+/// <summary>
+/// PRC-001: Admin endpoints for ChargeableCharConfig management.
+/// All endpoints require 'tasacion:caracteres_especiales:gestionar'.
+/// Route base: api/v1/admin/chargeable-chars
+/// </summary>
+[ApiController]
+[Route("api/v1/admin/chargeable-chars")]
+public sealed class ChargeableCharConfigController : ControllerBase
+{
+    private readonly IDispatcher _dispatcher;
+    private readonly IValidator<CreateChargeableCharConfigCommand> _createValidator;
+    private readonly IValidator<SchedulePriceChangeCommand> _scheduleValidator;
+
+    public ChargeableCharConfigController(
+        IDispatcher dispatcher,
+        IValidator<CreateChargeableCharConfigCommand> createValidator,
+        IValidator<SchedulePriceChangeCommand> scheduleValidator)
+    {
+        _dispatcher = dispatcher;
+        _createValidator = createValidator;
+        _scheduleValidator = scheduleValidator;
+    }
+
+    // ── GET /api/v1/admin/chargeable-chars ────────────────────────────────────
+
+    /// <summary>
+    /// Returns a paginated list of ChargeableCharConfig rows.
+    /// Filters: medioId (optional, long?), activeOnly (bool, default true).
+    /// Pagination: skip/take model mapped to page/pageSize — or use page/pageSize directly.
+    /// Defaults: page=1, pageSize=20. Clamped: pageSize max 200.
+    /// </summary>
+    [HttpGet]
+    [RequirePermission("tasacion:caracteres_especiales:gestionar")]
+    [ProducesResponseType(typeof(PagedResult<ChargeableCharConfigDto>), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    public async Task<IActionResult> List(
+        [FromQuery] long? medioId,
+        [FromQuery] bool activeOnly = true,
+        [FromQuery] int? page = null,
+        [FromQuery] int? pageSize = null,
+        [FromQuery] int? skip = null,
+        [FromQuery] int? take = null)
+    {
+        // Support both page/pageSize and skip/take query patterns
+        int resolvedPage;
+        int resolvedPageSize;
+
+        if (skip is not null || take is not null)
+        {
+            // Convert skip/take to page/pageSize
+            resolvedPageSize = Math.Min(take ?? 50, 200);
+            resolvedPage = resolvedPageSize > 0
+                ? ((skip ?? 0) / resolvedPageSize) + 1
+                : 1;
+        }
+        else
+        {
+            resolvedPage = page ?? 1;
+            resolvedPageSize = Math.Min(pageSize ?? 20, 200);
+        }
+
+        var query = new ListChargeableCharConfigQuery(medioId, activeOnly, resolvedPage, resolvedPageSize);
+        var result = await _dispatcher.Send<ListChargeableCharConfigQuery, PagedResult<ChargeableCharConfigDto>>(query);
+        return Ok(result);
+    }
+
+    // ── GET /api/v1/admin/chargeable-chars/{id} ───────────────────────────────
+
+    /// <summary>
+    /// Returns a single ChargeableCharConfig by Id. Returns 404 if not found.
+    /// </summary>
+    [HttpGet("{id:long}")]
+    [RequirePermission("tasacion:caracteres_especiales:gestionar")]
+    [ProducesResponseType(typeof(ChargeableCharConfigDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<IActionResult> GetById([FromRoute] long id)
+    {
+        var result = await _dispatcher.Send<GetChargeableCharConfigByIdQuery, ChargeableCharConfigDto?>(
+            new GetChargeableCharConfigByIdQuery(id));
+        return result is null ? NotFound() : Ok(result);
+    }
+
+    // ── POST /api/v1/admin/chargeable-chars ───────────────────────────────────
+
+    /// <summary>
+    /// Creates a new ChargeableCharConfig row. Closes the current active row for (MedioId, Symbol) if one exists.
+    /// Returns 201 Created with Location header pointing to GET /{id}.
+    /// </summary>
+    [HttpPost]
+    [RequirePermission("tasacion:caracteres_especiales:gestionar")]
+    [ProducesResponseType(typeof(CreateChargeableCharConfigResponse), StatusCodes.Status201Created)]
+    [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<IActionResult> Create([FromBody] CreateChargeableCharConfigRequest request)
+    {
+        var command = new CreateChargeableCharConfigCommand(
+            request.MedioId,
+            request.Symbol,
+            request.Category,
+            request.PricePerUnit,
+            request.ValidFrom);
+
+        var validation = await _createValidator.ValidateAsync(command);
+        if (!validation.IsValid)
+        {
+            var errors = validation.Errors
+                .GroupBy(e => e.PropertyName)
+                .ToDictionary(g => g.Key, g => g.Select(e => e.ErrorMessage).ToArray());
+            return BadRequest(new { errors });
+        }
+
+        var result = await _dispatcher.Send<CreateChargeableCharConfigCommand, CreateChargeableCharConfigResponse>(command);
+        return CreatedAtAction(nameof(GetById), new { id = result.Id }, result);
+    }
+
+    // ── PUT /api/v1/admin/chargeable-chars/{id}/price ────────────────────────
+
+    /// <summary>
+    /// Schedules a price change for an existing ChargeableCharConfig.
+    /// Closes the current active row and opens a new one with the new price + ValidFrom.
+    /// ValidFrom must be strictly greater than the existing row's ValidFrom (forward-only).
+    /// </summary>
+    [HttpPut("{id:long}/price")]
+    [RequirePermission("tasacion:caracteres_especiales:gestionar")]
+    [ProducesResponseType(typeof(SchedulePriceChangeResponse), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<IActionResult> SchedulePriceChange(
+        [FromRoute] long id,
+        [FromBody] SchedulePriceChangeRequest request)
+    {
+        var command = new SchedulePriceChangeCommand(id, request.PricePerUnit, request.ValidFrom);
+
+        var validation = await _scheduleValidator.ValidateAsync(command);
+        if (!validation.IsValid)
+        {
+            var errors = validation.Errors
+                .GroupBy(e => e.PropertyName)
+                .ToDictionary(g => g.Key, g => g.Select(e => e.ErrorMessage).ToArray());
+            return BadRequest(new { errors });
+        }
+
+        var result = await _dispatcher.Send<SchedulePriceChangeCommand, SchedulePriceChangeResponse>(command);
+        return Ok(result);
+    }
+
+    // ── PATCH /api/v1/admin/chargeable-chars/{id}/deactivate ─────────────────
+
+    /// <summary>
+    /// Deactivates a ChargeableCharConfig row (sets IsActive=false, ValidTo=today_AR).
+    /// Idempotent: calling on an already-inactive row is a no-op.
+    /// </summary>
+    [HttpPatch("{id:long}/deactivate")]
+    [RequirePermission("tasacion:caracteres_especiales:gestionar")]
+    [ProducesResponseType(typeof(DeactivateChargeableCharConfigResponse), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    public async Task<IActionResult> Deactivate([FromRoute] long id)
+    {
+        var result = await _dispatcher.Send<DeactivateChargeableCharConfigCommand, DeactivateChargeableCharConfigResponse>(
+            new DeactivateChargeableCharConfigCommand(id));
+        return Ok(result);
+    }
+}
+
+// ── Request body records ──────────────────────────────────────────────────────
+
+/// <summary>PRC-001: Create ChargeableCharConfig request body.</summary>
+public sealed record CreateChargeableCharConfigRequest(
+    long? MedioId,
+    string Symbol,
+    string Category,
+    decimal PricePerUnit,
+    DateOnly ValidFrom);
+
+/// <summary>PRC-001: Schedule price change request body.</summary>
+public sealed record SchedulePriceChangeRequest(
+    decimal PricePerUnit,
+    DateOnly ValidFrom);
diff --git a/src/api/SIGCM2.Api/Filters/ExceptionFilter.cs b/src/api/SIGCM2.Api/Filters/ExceptionFilter.cs
index 9b3602e..3df5936 100644
--- a/src/api/SIGCM2.Api/Filters/ExceptionFilter.cs
+++ b/src/api/SIGCM2.Api/Filters/ExceptionFilter.cs
@@ -3,6 +3,7 @@ using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.Filters;
 using Microsoft.Data.SqlClient;
 using SIGCM2.Domain.Exceptions;
+using SIGCM2.Domain.Pricing.Exceptions;
 
 namespace SIGCM2.Api.Filters;
 
@@ -645,6 +646,67 @@ public sealed class ExceptionFilter : IExceptionFilter
                 context.ExceptionHandled = true;
                 break;
 
+            // PRC-001: WordCounter + ChargeableCharConfig exceptions
+            case EmojiDetectedException emojiEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "emoji_not_allowed",
+                    code = "EMOJI_NOT_ALLOWED",
+                    message = emojiEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status400BadRequest
+                };
+                context.ExceptionHandled = true;
+                break;
+
+            case WordCountValidationException wordEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "word_count_validation",
+                    code = "WORD_COUNT_VALIDATION",
+                    field = wordEx.Field,
+                    reason = wordEx.Reason,
+                    message = wordEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status400BadRequest
+                };
+                context.ExceptionHandled = true;
+                break;
+
+            case ChargeableCharConfigInvalidException configInvalidEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "chargeable_char_invalid",
+                    code = "CHARGEABLE_CHAR_INVALID",
+                    field = configInvalidEx.Field,
+                    reason = configInvalidEx.Reason,
+                    message = configInvalidEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status400BadRequest
+                };
+                context.ExceptionHandled = true;
+                break;
+
+            case ChargeableCharConfigForwardOnlyException forwardOnlyCharEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "chargeable_char_forward_only",
+                    code = "CHARGEABLE_CHAR_FORWARD_ONLY",
+                    medioId = forwardOnlyCharEx.MedioId,
+                    symbol = forwardOnlyCharEx.Symbol,
+                    newValidFrom = forwardOnlyCharEx.NewValidFrom,
+                    activeValidFrom = forwardOnlyCharEx.ActiveValidFrom,
+                    message = forwardOnlyCharEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status409Conflict
+                };
+                context.ExceptionHandled = true;
+                break;
+
             case ValidationException validationEx:
                 var errors = validationEx.Errors
                     .GroupBy(e => e.PropertyName)
diff --git a/tests/SIGCM2.Api.Tests/Pricing/ChargeableChars/ChargeableCharConfigControllerTests.cs b/tests/SIGCM2.Api.Tests/Pricing/ChargeableChars/ChargeableCharConfigControllerTests.cs
new file mode 100644
index 0000000..a2f9132
--- /dev/null
+++ b/tests/SIGCM2.Api.Tests/Pricing/ChargeableChars/ChargeableCharConfigControllerTests.cs
@@ -0,0 +1,528 @@
+using System.Net;
+using System.Net.Http.Headers;
+using System.Net.Http.Json;
+using System.Text.Json;
+using Dapper;
+using FluentAssertions;
+using Microsoft.Data.SqlClient;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+using NSubstitute;
+using NSubstitute.ExceptionExtensions;
+using SIGCM2.Application.Abstractions.Security;
+using SIGCM2.Application.Audit;
+using SIGCM2.Application.Common;
+using SIGCM2.Application.Pricing.ChargeableChars;
+using SIGCM2.Domain.Entities;
+using SIGCM2.TestSupport;
+using Xunit;
+
+namespace SIGCM2.Api.Tests.Pricing.ChargeableChars;
+
+/// <summary>
+/// PRC-001 — E2E integration tests for:
+///   GET    /api/v1/admin/chargeable-chars
+///   GET    /api/v1/admin/chargeable-chars/{id}
+///   POST   /api/v1/admin/chargeable-chars
+///   PUT    /api/v1/admin/chargeable-chars/{id}/price
+///   PATCH  /api/v1/admin/chargeable-chars/{id}/deactivate
+///
+/// DB: SIGCM2_Test_Api (ApiIntegration collection — shared TestWebAppFactory).
+/// All mutations require 'tasacion:caracteres_especiales:gestionar' permission.
+/// </summary>
+[Collection("ApiIntegration")]
+public sealed class ChargeableCharConfigControllerTests : IAsyncLifetime
+{
+    private const string ConnectionString = TestConnectionStrings.ApiTestDb;
+
+    private readonly TestWebAppFactory _factory;
+    private readonly HttpClient _client;
+
+    public ChargeableCharConfigControllerTests(TestWebAppFactory factory)
+    {
+        _factory = factory;
+        _client = factory.CreateClient();
+    }
+
+    public Task InitializeAsync() => Task.CompletedTask;
+    public Task DisposeAsync() => Task.CompletedTask;
+
+    // ── Auth helpers ──────────────────────────────────────────────────────────
+
+    /// <summary>Admin token — has 'tasacion:caracteres_especiales:gestionar' via 'admin' role.</summary>
+    private string GetAdminToken()
+    {
+        var jwt = _factory.Services.GetRequiredService<IJwtService>();
+        return jwt.GenerateAccessToken(new Usuario(
+            id: 1, username: "admin", passwordHash: "x",
+            nombre: "Admin", apellido: "Sys", email: null,
+            rol: "admin", permisosJson: """{"grant":[],"deny":[]}""", activo: true));
+    }
+
+    /// <summary>Cajero token — does NOT have 'tasacion:caracteres_especiales:gestionar'.</summary>
+    private string GetCajeroToken()
+    {
+        var jwt = _factory.Services.GetRequiredService<IJwtService>();
+        return jwt.GenerateAccessToken(new Usuario(
+            id: 9999, username: "cajero_test", passwordHash: "x",
+            nombre: "Cajero", apellido: "Test", email: null,
+            rol: "cajero", permisosJson: """{"grant":[],"deny":[]}""", activo: true));
+    }
+
+    private HttpRequestMessage BuildRequest(
+        HttpMethod method, string url, object? body = null, string? token = null)
+    {
+        var req = new HttpRequestMessage(method, url);
+        if (token is not null)
+            req.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token);
+        if (body is not null)
+            req.Content = JsonContent.Create(body);
+        return req;
+    }
+
+    // ── DB seed helpers ───────────────────────────────────────────────────────
+
+    /// <summary>Inserts a ChargeableCharConfig row directly (bypasses SP guard) for scenario setup.</summary>
+    private async Task<long> SeedConfigDirectAsync(
+        long? medioId, string symbol, string category, decimal pricePerUnit,
+        DateOnly validFrom, DateOnly? validTo, bool isActive = true)
+    {
+        await using var conn = new SqlConnection(ConnectionString);
+        await conn.OpenAsync();
+        return await conn.QuerySingleAsync<long>("""
+            INSERT INTO dbo.ChargeableCharConfig
+                (MedioId, Symbol, Category, PricePerUnit, ValidFrom, ValidTo, IsActive, FechaCreacion)
+            VALUES (@MedioId, @Symbol, @Category, @PricePerUnit, @ValidFrom, @ValidTo, @IsActive, SYSUTCDATETIME());
+            SELECT CAST(SCOPE_IDENTITY() AS BIGINT);
+            """,
+            new
+            {
+                MedioId = medioId.HasValue ? (object)(int)medioId.Value : DBNull.Value,
+                Symbol = symbol,
+                Category = category,
+                PricePerUnit = pricePerUnit,
+                ValidFrom = validFrom.ToDateTime(TimeOnly.MinValue),
+                ValidTo = validTo.HasValue ? (object)validTo.Value.ToDateTime(TimeOnly.MinValue) : DBNull.Value,
+                IsActive = isActive ? 1 : 0
+            });
+    }
+
+    private static string TomorrowStr() =>
+        DateOnly.FromDateTime(DateTime.UtcNow).AddDays(1).ToString("yyyy-MM-dd");
+
+    private static string FutureDateStr(int daysAhead = 60) =>
+        DateOnly.FromDateTime(DateTime.UtcNow).AddDays(daysAhead).ToString("yyyy-MM-dd");
+
+    // ── GET /api/v1/admin/chargeable-chars ───────────────────────────────────
+
+    /// <summary>PRC-001-R3.1 — GET list returns paged result.</summary>
+    [Fact]
+    public async Task Get_List_ReturnsPagedResult()
+    {
+        // Seed 2 active rows with unique symbols to avoid conflicts
+        var sym1 = $"L{Guid.NewGuid():N}"[..1];
+        await SeedConfigDirectAsync(null, "§", "Currency", 1.50m,
+            new DateOnly(2026, 1, 1), null, true);
+
+        var token = GetAdminToken();
+        using var req = BuildRequest(HttpMethod.Get,
+            "/api/v1/admin/chargeable-chars?activeOnly=true", token: token);
+        var resp = await _client.SendAsync(req);
+
+        resp.StatusCode.Should().Be(HttpStatusCode.OK);
+        var body = await resp.Content.ReadFromJsonAsync<JsonElement>();
+        body.TryGetProperty("items", out _).Should().BeTrue("response must have 'items' property");
+        body.GetProperty("page").GetInt32().Should().BeGreaterThanOrEqualTo(1);
+        body.GetProperty("pageSize").GetInt32().Should().BeGreaterThanOrEqualTo(1);
+        body.GetProperty("total").GetInt32().Should().BeGreaterThanOrEqualTo(1);
+    }
+
+    [Fact]
+    public async Task Get_List_Unauthenticated_Returns401()
+    {
+        using var req = BuildRequest(HttpMethod.Get, "/api/v1/admin/chargeable-chars");
+        var resp = await _client.SendAsync(req);
+        resp.StatusCode.Should().Be(HttpStatusCode.Unauthorized);
+    }
+
+    [Fact]
+    public async Task Get_List_WithoutPermission_Returns403()
+    {
+        var token = GetCajeroToken();
+        using var req = BuildRequest(HttpMethod.Get, "/api/v1/admin/chargeable-chars", token: token);
+        var resp = await _client.SendAsync(req);
+        resp.StatusCode.Should().Be(HttpStatusCode.Forbidden);
+    }
+
+    // ── GET /api/v1/admin/chargeable-chars/{id} ──────────────────────────────
+
+    /// <summary>PRC-001-R3.1 — GET by id returns 200 + DTO.</summary>
+    [Fact]
+    public async Task Get_ById_Existing_Returns200()
+    {
+        var id = await SeedConfigDirectAsync(null, "€", "Currency", 2.00m,
+            new DateOnly(2026, 1, 1), null, true);
+
+        var token = GetAdminToken();
+        using var req = BuildRequest(HttpMethod.Get,
+            $"/api/v1/admin/chargeable-chars/{id}", token: token);
+        var resp = await _client.SendAsync(req);
+
+        resp.StatusCode.Should().Be(HttpStatusCode.OK);
+        var dto = await resp.Content.ReadFromJsonAsync<JsonElement>();
+        dto.GetProperty("id").GetInt64().Should().Be(id);
+        dto.GetProperty("symbol").GetString().Should().Be("€");
+        dto.GetProperty("isActive").GetBoolean().Should().BeTrue();
+    }
+
+    /// <summary>PRC-001-R3.1 — GET by non-existent id returns 404.</summary>
+    [Fact]
+    public async Task Get_ByIdMissing_Returns404()
+    {
+        var token = GetAdminToken();
+        using var req = BuildRequest(HttpMethod.Get,
+            "/api/v1/admin/chargeable-chars/999999999", token: token);
+        var resp = await _client.SendAsync(req);
+        resp.StatusCode.Should().Be(HttpStatusCode.NotFound);
+    }
+
+    // ── POST /api/v1/admin/chargeable-chars ──────────────────────────────────
+
+    /// <summary>PRC-001-R3.2 — POST valid payload returns 201 + Location header.</summary>
+    [Fact]
+    public async Task Post_WithValidPayload_Returns201WithLocation()
+    {
+        var token = GetAdminToken();
+        var validFrom = TomorrowStr();
+
+        using var req = BuildRequest(HttpMethod.Post, "/api/v1/admin/chargeable-chars",
+            body: new
+            {
+                medioId = (long?)null,
+                symbol = "¥",
+                category = "Currency",
+                pricePerUnit = 1.75m,
+                validFrom
+            },
+            token: token);
+        var resp = await _client.SendAsync(req);
+
+        resp.StatusCode.Should().Be(HttpStatusCode.Created);
+        resp.Headers.Location.Should().NotBeNull("201 must include Location header");
+
+        var body = await resp.Content.ReadFromJsonAsync<JsonElement>();
+        body.GetProperty("id").GetInt64().Should().BeGreaterThan(0);
+        body.GetProperty("symbol").GetString().Should().Be("¥");
+        body.GetProperty("validFrom").GetString().Should().Be(validFrom);
+    }
+
+    /// <summary>PRC-001-R3.5 — POST without auth returns 401.</summary>
+    [Fact]
+    public async Task Post_Unauthenticated_Returns401()
+    {
+        using var req = BuildRequest(HttpMethod.Post, "/api/v1/admin/chargeable-chars",
+            body: new { medioId = (long?)null, symbol = "£", category = "Currency", pricePerUnit = 1.0m, validFrom = TomorrowStr() });
+        var resp = await _client.SendAsync(req);
+        resp.StatusCode.Should().Be(HttpStatusCode.Unauthorized);
+    }
+
+    /// <summary>PRC-001-R3.5 — POST without permission returns 403.</summary>
+    [Fact]
+    public async Task Post_WithoutPermission_Returns403()
+    {
+        var token = GetCajeroToken();
+        using var req = BuildRequest(HttpMethod.Post, "/api/v1/admin/chargeable-chars",
+            body: new { medioId = (long?)null, symbol = "£", category = "Currency", pricePerUnit = 1.0m, validFrom = TomorrowStr() },
+            token: token);
+        var resp = await _client.SendAsync(req);
+        resp.StatusCode.Should().Be(HttpStatusCode.Forbidden);
+    }
+
+    /// <summary>PRC-001-R3.2 — POST invalid price returns 400 validation failure.</summary>
+    [Fact]
+    public async Task Post_InvalidPrice_Returns400ValidationFailure()
+    {
+        var token = GetAdminToken();
+        using var req = BuildRequest(HttpMethod.Post, "/api/v1/admin/chargeable-chars",
+            body: new { medioId = (long?)null, symbol = "£", category = "Currency", pricePerUnit = 0m, validFrom = TomorrowStr() },
+            token: token);
+        var resp = await _client.SendAsync(req);
+        resp.StatusCode.Should().Be(HttpStatusCode.BadRequest);
+    }
+
+    /// <summary>PRC-001-R2.7 — POST with symbol too long returns 400.</summary>
+    [Fact]
+    public async Task Post_SymbolTooLong_Returns400()
+    {
+        var token = GetAdminToken();
+        using var req = BuildRequest(HttpMethod.Post, "/api/v1/admin/chargeable-chars",
+            body: new { medioId = (long?)null, symbol = "$$$$$", category = "Currency", pricePerUnit = 1.0m, validFrom = TomorrowStr() },
+            token: token);
+        var resp = await _client.SendAsync(req);
+        resp.StatusCode.Should().Be(HttpStatusCode.BadRequest);
+    }
+
+    /// <summary>PRC-001-R2.6 — POST with past validFrom returns 400.</summary>
+    [Fact]
+    public async Task Post_WithPastValidFrom_Returns400()
+    {
+        var token = GetAdminToken();
+        using var req = BuildRequest(HttpMethod.Post, "/api/v1/admin/chargeable-chars",
+            body: new { medioId = (long?)null, symbol = "£", category = "Currency", pricePerUnit = 1.0m, validFrom = "2020-01-01" },
+            token: token);
+        var resp = await _client.SendAsync(req);
+        resp.StatusCode.Should().Be(HttpStatusCode.BadRequest);
+    }
+
+    /// <summary>
+    /// PRC-001-R2.7 — Emoji symbols are explicitly DEFERRED per spec.
+    /// The ChargeableCharConfig Symbol field accepts any 1–4 char value including emojis.
+    /// "😀" in C# has string.Length = 2 (UTF-16 surrogate pair), so it passes MaximumLength(4).
+    /// This test documents the deferred behavior: emoji in Symbol is accepted at config level.
+    /// The EmojiDetectedException applies only to WordCounterService (ad text, not config symbols).
+    /// </summary>
+    [Fact]
+    public async Task Post_WithEmojiSymbol_Returns201_BecauseEmojiRejectionIsDeferred()
+    {
+        var token = GetAdminToken();
+        // "😀" has C# string.Length == 2 (UTF-16 surrogate pair) — passes MaximumLength(4).
+        // Emoji rejection for config Symbols is deferred to PRC-002+ per spec R2.7.
+        using var req = BuildRequest(HttpMethod.Post, "/api/v1/admin/chargeable-chars",
+            body: new { medioId = (long?)null, symbol = "😀", category = "Currency", pricePerUnit = 1.0m, validFrom = TomorrowStr() },
+            token: token);
+        var resp = await _client.SendAsync(req);
+        // Accepted: emoji symbols deferred per spec. If business later rejects them, update validator + this test.
+        resp.StatusCode.Should().Be(HttpStatusCode.Created,
+            because: "emoji symbol rejection is deferred (spec R2.7). Symbol '😀' has length 2 in C# (UTF-16) → passes MaximumLength(4)");
+    }
+
+    // ── PUT /api/v1/admin/chargeable-chars/{id}/price ────────────────────────
+
+    /// <summary>PRC-001-R3.3 — PUT schedules price change, returns 200.</summary>
+    [Fact]
+    public async Task Put_PriceChange_Returns200()
+    {
+        // Seed an active row
+        var existingId = await SeedConfigDirectAsync(null, "★", "Currency", 1.00m,
+            new DateOnly(2026, 1, 1), null, true);
+
+        var token = GetAdminToken();
+        var newValidFrom = FutureDateStr(30);
+
+        using var req = BuildRequest(HttpMethod.Put,
+            $"/api/v1/admin/chargeable-chars/{existingId}/price",
+            body: new { pricePerUnit = 2.50m, validFrom = newValidFrom },
+            token: token);
+        var resp = await _client.SendAsync(req);
+
+        resp.StatusCode.Should().Be(HttpStatusCode.OK);
+        var body = await resp.Content.ReadFromJsonAsync<JsonElement>();
+        body.GetProperty("newId").GetInt64().Should().BeGreaterThan(0);
+        body.GetProperty("newValidFrom").GetString().Should().Be(newValidFrom);
+    }
+
+    /// <summary>PRC-001-R3.3 — PUT with retroactive date returns 409 ForwardOnly.</summary>
+    [Fact]
+    public async Task Put_PriceBackdateAttempt_Returns409()
+    {
+        // Seed an active row with a far-future ValidFrom
+        var existingId = await SeedConfigDirectAsync(null, "♦", "Currency", 1.00m,
+            new DateOnly(2099, 12, 1), null, true);
+
+        var token = GetAdminToken();
+        // Try to schedule before the existing ValidFrom
+        using var req = BuildRequest(HttpMethod.Put,
+            $"/api/v1/admin/chargeable-chars/{existingId}/price",
+            body: new { pricePerUnit = 2.00m, validFrom = "2099-11-01" },
+            token: token);
+        var resp = await _client.SendAsync(req);
+
+        resp.StatusCode.Should().Be(HttpStatusCode.Conflict);
+        var body = await resp.Content.ReadFromJsonAsync<JsonElement>();
+        body.GetProperty("error").GetString().Should().Be("chargeable_char_forward_only");
+    }
+
+    // ── PATCH /api/v1/admin/chargeable-chars/{id}/deactivate ────────────────
+
+    /// <summary>PRC-001-R3.4 — PATCH deactivate returns 200 OK.</summary>
+    [Fact]
+    public async Task Patch_Deactivate_Returns200()
+    {
+        var id = await SeedConfigDirectAsync(null, "▲", "Currency", 1.00m,
+            new DateOnly(2026, 1, 1), null, true);
+
+        var token = GetAdminToken();
+        using var req = BuildRequest(HttpMethod.Patch,
+            $"/api/v1/admin/chargeable-chars/{id}/deactivate", token: token);
+        var resp = await _client.SendAsync(req);
+
+        resp.StatusCode.Should().Be(HttpStatusCode.OK);
+    }
+
+    /// <summary>PRC-001 — PATCH deactivate on already-inactive row is idempotent → 200 OK.</summary>
+    [Fact]
+    public async Task Patch_Deactivate_AlreadyInactive_Returns200()
+    {
+        // Seed an already-inactive row
+        var id = await SeedConfigDirectAsync(null, "▼", "Currency", 1.00m,
+            new DateOnly(2026, 1, 1), new DateOnly(2026, 1, 31), false);
+
+        var token = GetAdminToken();
+        using var req = BuildRequest(HttpMethod.Patch,
+            $"/api/v1/admin/chargeable-chars/{id}/deactivate", token: token);
+        var resp = await _client.SendAsync(req);
+
+        // Idempotent — no exception thrown
+        resp.StatusCode.Should().Be(HttpStatusCode.OK);
+    }
+
+    // ── Audit ─────────────────────────────────────────────────────────────────
+
+    /// <summary>PRC-001-R3.6 — POST emits audit event chargeable_char_config.created.</summary>
+    [Fact]
+    public async Task AuditEvent_EmittedOnCreate()
+    {
+        var token = GetAdminToken();
+        var validFrom = TomorrowStr();
+
+        using var req = BuildRequest(HttpMethod.Post, "/api/v1/admin/chargeable-chars",
+            body: new { medioId = (long?)null, symbol = "↑", category = "Currency", pricePerUnit = 1.10m, validFrom },
+            token: token);
+        var resp = await _client.SendAsync(req);
+        resp.StatusCode.Should().Be(HttpStatusCode.Created,
+            because: "POST must succeed before we can verify audit");
+
+        var body = await resp.Content.ReadFromJsonAsync<JsonElement>();
+        var newId = body.GetProperty("id").GetInt64();
+
+        await using var conn = new SqlConnection(ConnectionString);
+        await conn.OpenAsync();
+        var auditCount = await conn.QuerySingleAsync<int>("""
+            SELECT COUNT(1) FROM dbo.AuditEvent
+            WHERE Action = 'tasacion.chargeable_char.create'
+              AND TargetType = 'ChargeableCharConfig'
+              AND TargetId = @TargetId
+            """, new { TargetId = newId.ToString() });
+
+        auditCount.Should().Be(1,
+            because: "IAuditLogger must record tasacion.chargeable_char.create after successful POST");
+    }
+
+    /// <summary>PRC-001-R3.6 — PUT price change emits audit event.</summary>
+    [Fact]
+    public async Task AuditEvent_EmittedOnPriceChange()
+    {
+        var existingId = await SeedConfigDirectAsync(null, "↗", "Currency", 1.00m,
+            new DateOnly(2026, 1, 1), null, true);
+
+        var token = GetAdminToken();
+        var newValidFrom = FutureDateStr(45);
+
+        using var req = BuildRequest(HttpMethod.Put,
+            $"/api/v1/admin/chargeable-chars/{existingId}/price",
+            body: new { pricePerUnit = 3.00m, validFrom = newValidFrom },
+            token: token);
+        var resp = await _client.SendAsync(req);
+        resp.StatusCode.Should().Be(HttpStatusCode.OK,
+            because: "PUT must succeed before we can verify audit");
+
+        var body = await resp.Content.ReadFromJsonAsync<JsonElement>();
+        var newId = body.GetProperty("newId").GetInt64();
+
+        await using var conn = new SqlConnection(ConnectionString);
+        await conn.OpenAsync();
+        var auditCount = await conn.QuerySingleAsync<int>("""
+            SELECT COUNT(1) FROM dbo.AuditEvent
+            WHERE Action = 'tasacion.chargeable_char.price_change'
+              AND TargetType = 'ChargeableCharConfig'
+              AND TargetId = @TargetId
+            """, new { TargetId = newId.ToString() });
+
+        auditCount.Should().Be(1,
+            because: "IAuditLogger must record tasacion.chargeable_char.price_change after successful PUT");
+    }
+
+    /// <summary>PRC-001-R3.6 — PATCH deactivate emits audit event.</summary>
+    [Fact]
+    public async Task AuditEvent_EmittedOnDeactivate()
+    {
+        var id = await SeedConfigDirectAsync(null, "→", "Currency", 1.00m,
+            new DateOnly(2026, 1, 1), null, true);
+
+        var token = GetAdminToken();
+        using var req = BuildRequest(HttpMethod.Patch,
+            $"/api/v1/admin/chargeable-chars/{id}/deactivate", token: token);
+        var resp = await _client.SendAsync(req);
+        resp.StatusCode.Should().Be(HttpStatusCode.OK,
+            because: "PATCH must succeed before we can verify audit");
+
+        await using var conn = new SqlConnection(ConnectionString);
+        await conn.OpenAsync();
+        var auditCount = await conn.QuerySingleAsync<int>("""
+            SELECT COUNT(1) FROM dbo.AuditEvent
+            WHERE Action = 'tasacion.chargeable_char.deactivate'
+              AND TargetType = 'ChargeableCharConfig'
+              AND TargetId = @TargetId
+            """, new { TargetId = id.ToString() });
+
+        auditCount.Should().Be(1,
+            because: "IAuditLogger must record tasacion.chargeable_char.deactivate after successful PATCH");
+    }
+
+    /// <summary>PRC-001-R3.7 — Audit failure rolls back insert (fail-closed).</summary>
+    [Fact]
+    public async Task Audit_Rollback_OnLoggerFailure()
+    {
+        await using var conn = new SqlConnection(ConnectionString);
+        await conn.OpenAsync();
+
+        var countBefore = await conn.ExecuteScalarAsync<int>(
+            "SELECT COUNT(1) FROM dbo.ChargeableCharConfig");
+
+        // Build a mock IAuditLogger that throws
+        var throwingAudit = Substitute.For<IAuditLogger>();
+        throwingAudit
+            .LogAsync(Arg.Any<string>(), Arg.Any<string>(), Arg.Any<string>(),
+                Arg.Any<object?>(), Arg.Any<CancellationToken>())
+            .ThrowsAsync(new InvalidOperationException("audit down — simulated failure"));
+
+        using var client = _factory.CreateClientWithOverrides(services =>
+        {
+            services.RemoveAll<IAuditLogger>();
+            services.AddScoped<IAuditLogger>(_ => throwingAudit);
+        });
+
+        var jwt = _factory.Services.GetRequiredService<IJwtService>();
+        var token = jwt.GenerateAccessToken(new Usuario(
+            id: 1, username: "admin", passwordHash: "x",
+            nombre: "Admin", apellido: "Sys", email: null,
+            rol: "admin", permisosJson: """{"grant":[],"deny":[]}""", activo: true));
+
+        var req = new HttpRequestMessage(HttpMethod.Post, "/api/v1/admin/chargeable-chars");
+        req.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token);
+        req.Content = JsonContent.Create(new
+        {
+            medioId = (long?)null,
+            symbol = "←",
+            category = "Currency",
+            pricePerUnit = 1.50m,
+            validFrom = TomorrowStr()
+        });
+
+        // Act
+        var resp = await client.SendAsync(req);
+
+        // Audit throws → unhandled → 500
+        resp.StatusCode.Should().Be(HttpStatusCode.InternalServerError,
+            because: "audit failure must propagate as 500 (fail-closed)");
+
+        // DB: no row was inserted
+        await using var verifyConn = new SqlConnection(ConnectionString);
+        await verifyConn.OpenAsync();
+        var countAfter = await verifyConn.ExecuteScalarAsync<int>(
+            "SELECT COUNT(1) FROM dbo.ChargeableCharConfig");
+
+        countAfter.Should().Be(countBefore,
+            because: "TransactionScope must roll back ChargeableCharConfig insert when audit fails");
+    }
+}