How to defeat cors for cdek, pochta api in vue3 production?

Question

CORS

Deployed a server for vue3, took the files from the dist folder and uploaded them to the server with the domain; configured nginx for links to work: try_files $uri $uri/ /index.html;
Everything works fine, it makes requests to my api without problems.
If I connect third-party services: cdek, pochta, then a CORS error falls out
. Where to dig, because these services are configured in order to make requests to them?