Move from the deprecated paypal.js library to the current paypal-checkout.js library?

[joshcampbell]

Background:

https://developers.braintreepayments.com/guides/paypal/vault/javascript/v3

The gem currently uses the old, deprecated paypal braintree library (https://js.braintreegateway.com/web/3.22.1/js/paypal.js). while current documentation only exists for the newer paypal-checkout library (https://js.braintreegateway.com/web/3.22.1/js/paypal-checkout.js).

Is someone at Solidus working on this already? Any insights as to when the deprecated library may actually stop working?

[tvdeyen]

I am currently looking into this

[seantaylor]

@tvdeyen If we're going to be moving from the paypal.js to the newer paypal-checkout.js it may also be a good time to upgrade from 3.22.1 to the latest? https://github.com/braintree/braintree-web/blob/master/CHANGELOG.md. Looks like some good bug fixes in there.

[alepore]

This was done on #170