Accepting Payments on WordPress – How to Choose and Integrate Your Payment Processor
https://www.elegantthemes.com/blog/tips-tricks/accepting-payments-on-wordpress-how-to-choose-and-integrate-your-payment-processor

Google Search “I want to develop a plugin that works with a credit card processor”
https://goo.gl/NJnZRe

Beanstream Internet Commerce Acquired by Bambora Group
http://www.douglasmagazine.com/beanstream-internet-commerce-acquired-by-bambora-group/

Bambora

https://www.bambora.com/
https://www.bambora.com/en/ca/blog/road-to-bambora/
https://www.bambora.com/en/ca/press/bambora-lands-in-north-america/

Moneris
https://www.moneris.com/

Moneris Solutions
https://en.wikipedia.org/wiki/Moneris_Solutions

Vantiv
https://www.vantiv.com/

EMV
https://en.wikipedia.org/wiki/EMV

PCI Security
https://www.pcisecuritystandards.org/pci_security/

WooCommerce Extensions Store
https://woocommerce.com/product-category/woocommerce-extensions/payment-gateways/direct/

Easy Pay
https://goeasypay.biz/

Zip Line
http://www.zipline.biz/… Read the rest