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Services/PaymentsService.cs

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+using System.Text.Json.Nodes;
+using Csob.Client;
+using Csob.Models;
+
+namespace Csob.Services;
+
+/// <summary>PISP – single payment initiation, status/detail, cancellation and the sign (SCA) flow.</summary>
+public sealed class PaymentsService
+{
+    private readonly CsobApiAccessor _accessor;
+
+    public PaymentsService(CsobApiAccessor accessor) => _accessor = accessor;
+
+    public Task<JsonNode?> InitiateAsync(PaymentInitiationRequest request, CancellationToken ct)
+        => _accessor.Client.PostAsync(CsobApiPaths.Payments, request, ct);
+
+    public Task<JsonNode?> DetailAsync(string id, CancellationToken ct)
+        => _accessor.Client.GetAsync(CsobApiPaths.Payment(id), null, ct);
+
+    public Task<JsonNode?> StatusAsync(string id, CancellationToken ct)
+        => _accessor.Client.GetAsync(CsobApiPaths.PaymentStatus(id), null, ct);
+
+    public Task<JsonNode?> CancelAsync(string id, CancellationToken ct)
+        => _accessor.Client.DeleteAsync(CsobApiPaths.Payment(id), ct);
+
+    /// <summary>Starts transaction authorization (SCA). Returns the redirect details for the PSU.</summary>
+    public Task<JsonNode?> StartSignAsync(string id, string signId, JsonNode? body, CancellationToken ct)
+        => _accessor.Client.PostAsync(CsobApiPaths.PaymentSign(id, signId), body, ct);
+
+    /// <summary>Gets the current state of an authorization (sign) transaction.</summary>
+    public Task<JsonNode?> SignStatusAsync(string id, string signId, CancellationToken ct)
+        => _accessor.Client.GetAsync(CsobApiPaths.PaymentSign(id, signId), null, ct);
+
+    /// <summary>Finalizes an authorization (sign) transaction.</summary>
+    public Task<JsonNode?> FinalizeSignAsync(string id, string signId, JsonNode? body, CancellationToken ct)
+        => _accessor.Client.PutAsync(CsobApiPaths.PaymentSign(id, signId), body, ct);
+}