first commit

Models/PaymentTransactions.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using Fitness_core_BE.Models.Enums;
+
+namespace Fitness_core_BE.Models
+{
+    public class PaymentTransaction
+    {
+        [Key]
+        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+        public Guid AttemptId { get; set; }
+
+        public DateTime? PayDate { get; set; }
+        public string PayStatus { get; set; }
+        public decimal PayAmount { get; set; }
+        public string? PayNote { get; set; }
+
+        public Guid? FK_CardId { get; set; }
+        [ForeignKey("FK_CardId")]
+        public virtual CustomerCards? CustomerCard { get; set; }
+
+        public Guid? FK_CustomerInvoiceId { get; set; }
+        [ForeignKey("FK_CustomerInvoiceId")]
+        public virtual CustomerInvoice? CustomerInvoice { get; set; }
+
+        public Guid? FK_ClientInvoiceId { get; set; }
+        [ForeignKey("FK_ClientInvoiceId")]
+        public virtual ClientInvoice? ClientInvoice { get; set; }
+
+        public Guid? FK_ClientId { get; set; }
+        [ForeignKey("FK_ClientId")]
+        public virtual Client? Client { get; set; }
+
+        public Guid? FK_CustomerId { get; set; }
+        [ForeignKey("FK_CustomerId")]
+        public virtual Customer? Customer { get; set; }
+
+        public BeneficiaryType? BeneficiaryType { get; set; }
+        public string? RefType { get; set; } = "installment";
+        // How a manually-recorded (counter) payment was actually taken -- "Cash" | "Bank".
+        // Left null for gateway/auto-charge attempts, where the method is implied elsewhere.
+        public string? PaymentMethod { get; set; }
+        public string? BankRefNo { get; set; }
+        public string? PaymentReferenceId { get; set; }
+        public bool? IsActive { get; set; } = true;
+        public bool? IsApproved { get; set; } = false;
+    }
+}