Third Party Providers (TPPs) using the links provided can integrate and test Telekom Payments PSD2 API Sandbox.
Please use the following link:
https://priora.saltedge.com/docs/berlingroup/cosmote_sandbox_gr_xf#getting-started
in order to proceed with TPP onboarding and learn more on how to get access to the testing environment, by clicking here :
https://priora-demo.saltedge.com/users/sign_in
Telekom Payments PSD2 Production API Documentation
http://priora.saltedge.com/docs/berlingroup/cosmote_payments