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Use the Access-Control-Allow-Origin header
This guide helps you set up the header "Access-Control-Allow-Origin", a HTTP header which specifies which origin (domain, protocol and port) can access resources on a server. This header is used to control cross-origin access (CORS) from a web application.
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List of authorised domains
You can add the origin of a query to the list of domains allowed to access server resources by adding it to the header values Access-Control-Allow-Origin.
To authorize e.g. the site https://domain.xyz access resources with CORS, the header must be as follows:
Access-Control-Allow-Origin: https://domain.xyzYou can adjust it via the function header() PHP by inspiring you to this guide In particular.
If you need this header to be applied everywhere, you can go through a self-prepends.