Quote Originally Posted by gernot View Post
Would be interested to hear other experiences along these lines.
We have been using the Square module (still using 0.97) since January 2020, and it is indeed very convenient because of its seamless integration into the checkout page, unlike, say, Paypal.

There is a major shortcoming though: At least in Japan there is the following restriction, notice of which we received from their support staff after several INVALID_CARD transaction failures.

Online use via the E-Commerce API only permits transactions for 3 credit card types: VISA, MasterCard, American Express.

The following additional 3 card types can only be used physically, via the Square Reader (card reader): JCB, Diner's Club, Discover Card.

So the use of the module is sadly quite limited for online transactions. I am still waiting for confirmation as to whether this is a regional restriction for Japan, or a world-wide Square restriction. It is confusing since in one's Square account one needs to make a special application for JCB use approval, which we made and received the OK for, but there is no mention that one cannot actually use JCB and related cards with the E-Commerce API.
What are your settings for configuration->credit cards?