Support for spree 2.4

[christoph-buente]

Is there a chance this extensions gets a version bump to 2.4? It would be really appreciated.

[JDutil]

I would recommend you use https://github.com/spree-contrib/spree_store_credit_payment_method which is being merged with core. This extension is pretty much dead, and doesn't even have a 2.3 branch let alone 2.4.