feat(FE): Add travel document upload to purchase form

src/services/api/purchase.ts

@@ -72,11 +72,29 @@ export const PurchaseApi = {
       purchaseRequestId: number,
       payload: CreateAcceptApprovalRequestPayload
     ): Promise<BaseApiResponse<{ message: string }> | undefined> => {
+      const formData = new FormData();
+
+      formData.append('action', payload.action);
+
+      if (payload.notes) {
+        formData.append('notes', payload.notes);
+      }
+
+      if (payload.items) {
+        formData.append('items', JSON.stringify(payload.items));
+      }
+
+      if (payload.travel_documents) {
+        payload.travel_documents.forEach((file) => {
+          formData.append('travel_documents', file);
+        });
+      }
+
       return await basePurchaseApi.customRequest<
         BaseApiResponse<{ message: string }>
       >(`${purchaseRequestId}/receipts`, {
         method: 'POST',
-        payload,
+        payload: formData as unknown as Record<string, unknown>,
       });
     },
   },