Add support to Payment Links as core_resource

[vittoriabitton]

Adds support to PaymentLink as a core_resource.

Stripe docs: https://stripe.com/docs/payments/payment-links/api

[vittoriabitton]

Hey, @joshsmith @snewcomer do you folks mind checking this PR out? 😁 It will help us a ton!

[snewcomer]

@vittoriabitton Great! Looks like we have a failing test on OTP 24/Elixir 1.12.

[vittoriabitton]

Hey, @snewcomer thanks for the reply!

Locally the same test file passes :/ in the CI pipeline it fails in building the request URL and I'm wondering if there is a different configuration for the CI for the assert_stripe_requested/3 for fetching the base URL or something. Maybe you can help us here?

Thanks a lot in advance!

[vittoriabitton]

Going through the ci.yml seems everything is fine...I'm not sure if it is some env var on the ConfigTest module.

[vittoriabitton]

One thing that I've noticed is that is missing the handle_info callback implementation for StripeMock so when I run a plain mix test it just shuts the application (I guess this can be either fixed or configured on the supervision tree), giving this error.

So I'm basically running one single test at a time (that does not require the GenServer to be up and running)...so not sure if missed something here 😅. But would be glad to help too if I can have a bit more context.

[snewcomer]

With the bump something about TerminalLocation has changed?

[vittoriabitton]

@snewcomer can you run the CI again, please? 😄

[snewcomer]

Thank you!

[mlexs]

Thank you! 😍 Exactly what I need just now.