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Models/Common.cs

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+using System.Text.Json.Nodes;
+
+namespace Csob.Models;
+
+// Reusable building blocks shared by the typed PISP request bodies. Field names follow the COBS
+// JSON contract (camelCase via System.Text.Json web defaults). Deeply variable sub-trees (party
+// identification, structured remittance) are typed as JsonNode so any valid COBS payload passes
+// through unchanged.
+
+/// <summary>Monetary amount with ISO 4217 currency.</summary>
+public sealed class Amount
+{
+    public decimal Value { get; set; }
+    public string Currency { get; set; } = "CZK";
+}
+
+/// <summary>Wrapper matching the <c>amount</c> object whose <c>instructedAmount</c> holds the value/currency.</summary>
+public sealed class AmountContainer
+{
+    public Amount InstructedAmount { get; set; } = new();
+}
+
+/// <summary>Account number identification. For domestic/SEPA writes only <c>iban</c> is required.</summary>
+public sealed class AccountIdentification
+{
+    public string? Iban { get; set; }
+    public string? Other { get; set; }
+}
+
+/// <summary>Account reference with optional currency (<c>debtorAccount</c>/<c>creditorAccount</c>).</summary>
+public sealed class AccountReference
+{
+    public AccountIdentification Identification { get; set; } = new();
+    public string? Currency { get; set; }
+}
+
+public sealed class ServiceLevel
+{
+    /// <summary>Payment scheme: DMCT (domestic), ESCT (SEPA), XBCT (cross-border), EXCT, NXCT.</summary>
+    public string? Code { get; set; }
+}
+
+public sealed class PaymentTypeInformation
+{
+    /// <summary>NORM (default), HIGH (express) or INST (instant).</summary>
+    public string? InstructionPriority { get; set; }
+    public ServiceLevel? ServiceLevel { get; set; }
+}
+
+public sealed class FinancialInstitutionIdentification
+{
+    public string? Bic { get; set; }
+}
+
+public sealed class Agent
+{
+    public FinancialInstitutionIdentification? FinancialInstitutionIdentification { get; set; }
+}
+
+public sealed class PostalAddress
+{
+    public string? StreetName { get; set; }
+    public string? BuildingNumber { get; set; }
+    public string? PostCode { get; set; }
+    public string? TownName { get; set; }
+    public string? Country { get; set; }
+}
+
+/// <summary>A party (debtor/creditor/ultimate*). Identification is variable, so kept as raw JSON.</summary>
+public sealed class Party
+{
+    public string? Name { get; set; }
+    public PostalAddress? PostalAddress { get; set; }
+    public JsonNode? Identification { get; set; }
+}
+
+/// <summary>
+/// Remittance information. <c>unstructured</c> is free text (Czech symbols may be encoded as
+/// <c>/VS/.../SS/.../KS/...</c>); <c>structured</c> varies (its <c>reference</c> may be a string or
+/// an array) so it is passed through as raw JSON.
+/// </summary>
+public sealed class RemittanceInformation
+{
+    public string? Unstructured { get; set; }
+    public JsonNode? Structured { get; set; }
+}
+
+public sealed class Purpose
+{
+    public string? Proprietary { get; set; }
+}