Add payment for tournaments

[KwikKill]

• Fixed a bug where team id was used instead of registration id to apply the right class
• Add a backend api call to the payment endpoint with product id.

Because of the use of notifications, i was not able to test the entire workflow but "in theory", if the back is working as intended and the env file is the right, this should work fine as it only use axios interceptor to display error message and follow redirection.