add support for passing payment method type

src/Core/Models/Api/Request/PaymentRequestModel.cs

@@ -1,9 +1,12 @@
 using System.ComponentModel.DataAnnotations;
+using Bit.Core.Enums;
 
 namespace Bit.Core.Models.Api
 {
     public class PaymentRequestModel
     {
+        // TODO: Required in future
+        public PaymentMethodType? PaymentMethodType { get; set; }
         [Required]
         public string PaymentToken { get; set; }
     }