Stripe configs

1/ Frans uses Stripe in Pre-auth mode. Make sure your localhost environment also uses Pre-auth mode. In config, change `Payment action` to `Authorize Only`:

2/ To debug local stripe connect (local webhook):
Install Stripe CLI
In command line, enter `stripe listen --forward-to http://sfran/stripe/webhooks`

Stripe cli will inform the webhook secret, such as:
```
> Ready! You are using Stripe API Version [2016-02-23]. Your webhook signing secret is whsec_123456 (^C to quit)
```

Copy that secret into table stripe_webhooks, column secret. Make sure that table only has 1 row; to avoid confusion.