Opencart integtation Api with Shipping company

hello plz check files first i have a store The store is an Open Cart Journal 3 template There is an addition of Multi Vendor (something will be clarified regarding this) An Extension to opencart must be programmed to link the store and the shipping company so that with every order the request is sent with all information to the shipping company. so that they can know how to Send the shipment to our customers. The products can be from different stores so the complete information should be sent for example: Product 1 details from store 1 and its details Product 2 from store 2 and all the details Product 3 may be from the same store, following is Store 2 so if a customer make an order product 1 and product 2 and 3 the info that will send are 1- the location and order of product 1 2- 1- the location and order of product 2 and 3 bcz they are the same sotre 3- the customer information plz check the files uploaded these files are from the shipping company Api if any info or more explanasion is needed plz told me