Commits on Sep 28, 2023

1. Add Pro sign up ban check …

   When a YAML config file is present, check the payment card before the
   pro subscription is created.
   
   With the YAML:
   
   ```yaml
   - fingerprint: 123abc456DEF789gh
     address_zip: AB11AB
   - address_zip: CD11CD
   ```
   
   This would add two bans. Prevent sign up if the payment card entered
   matches:
   1. the fingerprint and postcode `AB1 1AB`,
   or
   2. the postcode `cd11cd`
   
   For fingerprint, these come from the Stripe dashboard and are unique for
   a given card. See: https://stripe.com/docs/api/cards/object#card_object-fingerprint
   
   For postcodes/address zip we upcase and strip all white space from what
   is provided on the payment form.

   

   gbp committed Sep 28, 2023
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