Save bidirectional association for customer_id in redis

Hide loading spinner on error so the error state can show

In production, require customer_id be passed also.

As a security measure, so people can't modify the cards on arbitrary JIDs.

ci

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Going to use this as a customer id for the whole billing system

So it's not really braintree specific, even if we make it match the one there.

fix typo

Initial commit