Hello about api integration

[Elyssa1000]

Can you please help me? The logistician gave me the API key of his warehouse and asked me to link it to my Shopify store. Can you explain to me how I can do that, or do you have any information about this warehouse (Diapason) in your database regarding how they work and the methods they use? I know how to get an API key from Shopify by creating a private app, but he's asking for the reverse of this method. If you have any ideas, it would be a pleasure.