first commit

common/resources/client/billing/billing-page/requests/use-change-subscription-plan.ts

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+import {useMutation} from '@tanstack/react-query';
+import {apiClient} from '../../../http/query-client';
+import {useTrans} from '../../../i18n/use-trans';
+import {BackendResponse} from '../../../http/backend-response/backend-response';
+import {toast} from '../../../ui/toast/toast';
+import {message} from '../../../i18n/message';
+import {User} from '../../../auth/user';
+import {invalidateBillingUserQuery} from '../use-billing-user';
+import {useNavigate} from '../../../utils/hooks/use-navigate';
+import {showHttpErrorToast} from '../../../utils/http/show-http-error-toast';
+
+interface Response extends BackendResponse {
+  user: User;
+}
+
+interface Payload {
+  subscriptionId: number;
+  newProductId: number;
+  newPriceId: number;
+}
+
+export function useChangeSubscriptionPlan() {
+  const {trans} = useTrans();
+  const navigate = useNavigate();
+  return useMutation({
+    mutationFn: (props: Payload) => changePlan(props),
+    onSuccess: () => {
+      toast(trans(message('Plan changed.')));
+      invalidateBillingUserQuery();
+      navigate('/billing');
+    },
+    onError: err => showHttpErrorToast(err),
+  });
+}
+
+function changePlan({subscriptionId, ...other}: Payload): Promise<Response> {
+  return apiClient
+    .post(`billing/subscriptions/${subscriptionId}/change-plan`, other)
+    .then(r => r.data);
+}