Initial commit

src/PowderCoating.Core/Entities/Refund.cs

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+using PowderCoating.Core.Enums;
+
+namespace PowderCoating.Core.Entities;
+
+/// <summary>
+/// Records a refund issued to a customer against an invoice.
+/// Does not move actual money — the shop issues the refund manually.
+/// </summary>
+public class Refund : BaseEntity
+{
+    public int InvoiceId { get; set; }
+    public int? PaymentId { get; set; }     // Specific payment being refunded (optional)
+
+    public decimal Amount { get; set; }
+    public DateTime RefundDate { get; set; } = DateTime.UtcNow;
+    public PaymentMethod RefundMethod { get; set; }
+    public string Reason { get; set; } = string.Empty;
+    public string? Reference { get; set; }  // Check #, transaction ID, etc.
+    public string? Notes { get; set; }
+
+    public RefundStatus Status { get; set; } = RefundStatus.Pending;
+    public DateTime? IssuedDate { get; set; }
+    public string? IssuedById { get; set; }
+
+    // For store-credit refunds: the CreditMemo created on their behalf
+    public int? CreditMemoId { get; set; }
+
+    // Navigation
+    public virtual Invoice Invoice { get; set; } = null!;
+    public virtual Payment? Payment { get; set; }
+    public virtual ApplicationUser? IssuedBy { get; set; }
+    public virtual CreditMemo? CreditMemo { get; set; }
+}