Enable REST request on payment gateway endpoints

Author: itsmeichigo

Networking/Networking/Remote/PaymentGatewayRemote.swift

@@ -11,7 +11,11 @@ public class PaymentGatewayRemote: Remote {
     ///     - completion: Closure to be executed upon completion.
     ///
     public func loadAllPaymentGateways(siteID: Int64, completion: @escaping (Result<[PaymentGateway], Error>) -> Void) {
-        let request = JetpackRequest(wooApiVersion: .mark3, method: .get, siteID: siteID, path: Constants.path)
+        let request = JetpackRequest(wooApiVersion: .mark3,
+                                     method: .get,
+                                     siteID: siteID,
+                                     path: Constants.path,
+                                     availableAsRESTRequest: true)
         let mapper = PaymentGatewayListMapper(siteID: siteID)
         enqueue(request, mapper: mapper, completion: completion)
     }
@@ -35,7 +39,8 @@ public class PaymentGatewayRemote: Remote {
                                          method: .put,
                                          siteID: siteID,
                                          path: path,
-                                         parameters: parameters)
+                                         parameters: parameters,
+                                         availableAsRESTRequest: true)
 
             let mapper = PaymentGatewayMapper(siteID: siteID)