FTP connection to API on Amazon SPI + Temu + eBay + Shopify

We need to update our stock levels on marketplaces with API.

We have:
- Amazon Seller Central (SPI is approved)
- Temu
- eBay
- Shopify

- The file with the correct stock levels is sat on an FTP. The FTP is owned by the supplier who will provide log in details
- All the SKUs are the same on all marketplaces
- File update is every 30 minutes

We need someone to build the API connections and update the stock levels. Further to this, we will add another supplier in the future. This means there will be two files in future from two different APIs.

This is probably the best format:
FTP Our file on cloud server Marketplace API

We need to allow 3 days for this to be made and delivered after testing. Start date on Monday and completion by Wednesday.