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Models/Payments.cs

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+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Csob.Models;
+
+public sealed class PaymentIdentification
+{
+    /// <summary>Unique instruction id assigned by the TPP (idempotency key). Max 35 chars.</summary>
+    public string? InstructionIdentification { get; set; }
+    public string? EndToEndIdentification { get; set; }
+}
+
+/// <summary>
+/// Payment initiation request (<c>POST /my/payments</c>). Covers domestic (DMCT) and SEPA (ESCT)
+/// payments — SEPA-only fields (creditor address, agent, ultimate parties, purpose) are optional.
+/// Any additional COBS field not modelled here is preserved via <see cref="AdditionalData"/>.
+/// </summary>
+public sealed class PaymentInitiationRequest
+{
+    public PaymentIdentification? PaymentIdentification { get; set; }
+    public PaymentTypeInformation? PaymentTypeInformation { get; set; }
+    public AmountContainer Amount { get; set; } = new();
+    public string? RequestedExecutionDate { get; set; }
+
+    public Party? UltimateDebtor { get; set; }
+    public AccountReference DebtorAccount { get; set; } = new();
+    public Agent? CreditorAgent { get; set; }
+    public Party? Creditor { get; set; }
+    public AccountReference CreditorAccount { get; set; } = new();
+    public Party? UltimateCreditor { get; set; }
+
+    public RemittanceInformation? RemittanceInformation { get; set; }
+    public Purpose? Purpose { get; set; }
+
+    /// <summary>Any COBS fields not explicitly modelled are forwarded to ČSOB unchanged.</summary>
+    [JsonExtensionData]
+    public Dictionary<string, JsonElement>? AdditionalData { get; set; }
+}