Change confirm expand client request to hit a separate endpoint from self hosted purchases confirm.

webapp/platform/client/src/client4.ts

@@ -3899,7 +3899,7 @@ export default class Client4 {
 
     confirmSelfHostedExpansion = (setupIntentId: string, expandRequest: SelfHostedExpansionRequest) => {
         return this.doFetch<SelfHostedSignupSuccessResponse>(
-            `${this.getHostedCustomerRoute()}/confirm?expand=true`,
+            `${this.getHostedCustomerRoute()}/confirm-expand`,
             {method: 'post', body: JSON.stringify({stripe_setup_intent_id: setupIntentId, expand_request: expandRequest})},
         );
     }