We apologize for the instability of composr.app and appreciate your patience. We are working on the statistics addon and trying to find an optimal way to store and render data. Unfortunately, we have yet to find a solution that can handle the traffic (and therefore, tens of millions of statistical records) of composr.app. We're working hard on one.
Square:
No application needed: Yes
Transparent pricing: Yes
No monthly fee: Yes
Reasonable per-transaction percentages: Yes (2.9%, 3.5% for subscriptions)
No bad reputation: Yes
Targets micro businesses: Yes
Payment button+IPN API: Yes (https://developer.squareup.com/docs/checkout-api or https://developer.squareup.com/docs/web-payments/overview)
Local payments API: No (there seems to be a REST API but not for taking payments)
Reasonably modern website: Yes
Reasonably stable business: Yes
International: Yes
No bank merchant account needed: Yes
Supports subscriptions: Yes
Supported by PHP Omnipay library: Yes
Issues: Does not allow membership of clubs which is a big deal breaker https://squareup.com/help/us/en/article/5089-prohibited-goods-and-services-with-square-point-of-sale
Notes: I think you can support Bitcoin via the user choosing a CashApp payment but it's not clear
No application needed: Yes
Transparent pricing: Yes
No monthly fee: Yes
Reasonable per-transaction percentages: Yes (2.9%, 3.5% for subscriptions)
No bad reputation: Yes
Targets micro businesses: Yes
Payment button+IPN API: Yes (https://developer.squareup.com/docs/checkout-api or https://developer.squareup.com/docs/web-payments/overview)
Local payments API: No (there seems to be a REST API but not for taking payments)
Reasonably modern website: Yes
Reasonably stable business: Yes
International: Yes
No bank merchant account needed: Yes
Supports subscriptions: Yes
Supported by PHP Omnipay library: Yes
Issues: Does not allow membership of clubs which is a big deal breaker https://squareup.com/help/us/en/article/5089-prohibited-goods-and-services-with-square-point-of-sale
Notes: I think you can support Bitcoin via the user choosing a CashApp payment but it's not clear