The review of the proxy shipping application has been rejected

The application review has been rejected and there needs to be an active fulfillment button for orders in Shopify store, as shown in the picture https://screenshot.click/17-18-83237-92609.png How can I implement this feature and pass the review. What is the purpose of FulfillmentOrderSubmitFulfillmentRequest? Email ID 58283648, please tell me how to solve it. I have already communicated via email three times without a solution