Shopify Expert Freelancer

Dear Sir or Madam, dear freelancers, web designers, programmers! For my first project, an online shop, I am looking for a person who will establish a functioning connection / synchronization with my supplier. This provider offers various options for integration into his shop system. I decided on an extension. So there is no need to program an API from scratch, just create a private Shopify app with permissions in Shopify settings (already done) and select the correct settings in my control board on the provider's HP. There is already a connection to the supplier (including over 25,000 products), this is faulty, so the existing connection must first be released / terminated. Start immediately. I'm looking forward to your message :)