In app purchase, how to define license id and merchant id?

but in the new version of kodular how to give any license id and merchant id or if there are any free extensions of the in app billing

according to the documentation In App Billing - Kodular Docs you do not need them anymore

there is my paid extension available App Inventor Extensions: Billing | Pura Vida Apps
and there was @pavi2410’s billing extension available, but it is outdated meanwhile


Actually, I am a kid developer, so I can not buy it

but it is not working without test mode

I never used the built in billing component…
it would be good to know, if there is someone who successfully used the built in billing component in a project?