[SM-288] Rename requests and responses to follow naming convention (#3806)

libs/common/src/models/response/billing-payment.response.ts

@@ -0,0 +1,14 @@
+import { BaseResponse } from "./base.response";
+import { BillingSourceResponse } from "./billing.response";
+
+export class BillingPaymentResponse extends BaseResponse {
+  balance: number;
+  paymentSource: BillingSourceResponse;
+
+  constructor(response: any) {
+    super(response);
+    this.balance = this.getResponseProperty("Balance");
+    const paymentSource = this.getResponseProperty("PaymentSource");
+    this.paymentSource = paymentSource == null ? null : new BillingSourceResponse(paymentSource);
+  }
+}