change payment methods between stripe and paypal

src/Core/Models/Table/ISubscriber.cs

@@ -1,15 +1,18 @@
-using Bit.Core.Enums;
+using System;
+using Bit.Core.Enums;
 using Bit.Core.Services;
 
 namespace Bit.Core.Models.Table
 {
     public interface ISubscriber
     {
+        Guid Id { get; }
         GatewayType? Gateway { get; set; }
         string GatewayCustomerId { get; set; }
         string GatewaySubscriptionId { get; set; }
         string BillingEmailAddress();
         string BillingName();
+        string BraintreeCustomerIdPrefix();
         IPaymentService GetPaymentService(GlobalSettings globalSettings);
     }
 }