Creating Shopify connections via API call

Hi, does anyone know how to create a shopify connection with an HTTP call? I’ve made connections with wordpress and openai similarly before, but shopify requires oauth.

I would excpect to get a redirection link after this request, to authenticate inside of shopify, but nothing happens, I just get a connectionId of a non-existing shopify connection.

Here’s the request body:

And here’s the output:

Please help.