I m getting cors issue when making a POST request to an external endpoint.

I'm trying to make a request to mamopay to create a link (https://mamopay.readme.io/reference/post_links) and I'm getting cors error on clickfunnel:

Access to fetch at 'https://sandbox.dev.business.mamopay.com/manage_api/v1/links' from origin 'https://.....' has been blocked by CORS policy: Request header field authorization is not allowed by Access-Control-Allow-Headers in preflight response.

Can you help me out?