[keycloak-user] Integrating with Stripe

Hi, I would like to extend the registration and account pages to collect payment details using Stripe. Since I am using the docker container, I thought it may be easiest to pass the Stripe token and an API endpoint as environment variables to the container. Then, by extending the themes, I could collect the card details using Stripe.js and send the token to my API to create a customer token that I could add to user attributes in Keycloak. I know that environment variables are not currently accessible in the freemarker templates so if this is considered a reasonable use-case I'd be willing to open an enhancement request; otherwise I would be interested in alternative solutions. Thanks! Marc