Build Magento 2 Extension / Import products via sellers API -- .. -- ..

Hello. Please read carefully and respond. We need to communicate with 2 different places (APIs) to import our catalog products. Both are REST type requests and will connect via their APIs. Each has its own structure so it will be TWO SEPARATE EXTENSIONS. Since it's furniture store there is different in the categories, so for example mattresses will get only sizes configs and Sofa can have also colors. Also there is related products for some of the catalog products. If you have a lot of experience with Magento 2 let us know and we will send more info. Thank you.