Add authorize/capture and customer update to Pin Payments gateway

[keithpitt]

Added the following new methods to the Pin Payments gateway:

• #authorize(money, creditcard, options)
• #capture(money, token, options)
• #update(customer_token, credit_card, address: { ... })
• #update_customer(customer_token, email: "[email protected]")

[ntalbott]

Hey @keithpitt, great to see Pin getting auth/capture!

On the update methods:

• update_customer is out of scope for ActiveMerchant - please remove.
• update needs to match the signature used by other gateways (update(token, credit_card, options)), and I'm not clear if the current signature you have does; the key thing is that the token returned by store should be the token passed to update - is that the case here?

Can't wait to get this reviewed and merged - thanks!

[ntalbott]

@keithpitt update_customer is out of scope for ActiveMerchant - can you pull it out? Otherwise this looks good.

[keithpitt]

Hey @ntalbott, sorry for the late reply. I've removed the update_customer method.

You do pass the card token to update, see: https://github.com/Shopify/active_merchant/pull/1268/files#diff-fd69b950fb50e7849fecfb121ce5ab1bR103

Thanks again for poking me about this :)

[keithpitt]

Thanks for taking the time to do this for me :) ❤️