Payment Open Application Programming Interfaces (i.e. Open APIs) "History"

Here is a quick "History" of the Payment Open Application Programming Interfaces (i.e. Open APIs):

PAYPAL
20 June 2005:
PayPal Announces Website Payments Pro, A New Payment Product For Small Businesses
"Website Payments Pro features three new functions: Express Checkout, Direct Payment API and Virtual Terminal."
"For buyers who don't have PayPal accounts, Direct Payment API lets merchants accept credit card transactions just as they would with traditional merchant accounts."
https://www.paypal-media.com/releasedetail.cfm?ReleaseID=166510

GOOGLE
29 June 2006:
Google Checkout Opens for Business
"These integration options include cut-and-paste buy buttons, as well as an advanced API that integrates with existing merchant shopping carts and order management systems."
http://www.google.com/press/pressrel/checkout.html

AMAZON
2 August 2007:
Amazon Flexible Payments Service (Amazon FPS) - Limited Beta
"The set of web services APIs allows the movement of money between any two entities, humans or computers."
http://aws.amazon.com/about-aws/whats-new/2007/08/02/amazon-flexible-payments-service-amazon-fps---limited-beta/

PAYPAL Adaptive Payments
23 July 2009:
PayPal to Become First Truly Global Payment Platform Open to Third-Party Developers
"Today PayPal announced plans to open its payment platform to third-party developers with the release of new APIs (Application Programming Interfaces) that allow developers to embed PayPal's secure global payment system into their applications and platforms."
https://www.paypal-media.com/releasedetail.cfm?ReleaseID=398758

YAHOO
28 August 2009:
Order and Payment APIs General Release
"Order and Payment APIs are now available to all Merchant Solutions Standard, Professional, and Yahoo! Store merchants."
http://www.ystoreblog.com/blog/2009/08/access-manager-order-and-payment-apis-general-release-and-checkout-enhancements/

MASTERCARD
25 May 2010:
MasterCard to Unleash Payment Innovation by Launching New Open API Developer Portal
"Select MasterCard Payment and Data Services Will be Released via Open API to Worldwide Software Developer Community to Create New, Innovative Payment Applications"
"The new Open API program is the first initiative from the newly created MasterCard Labs."
http://www.mastercard.com/us/company/en/newsroom/mc_launching_new_open_api_developer_portal.html

VISA
25 October 2010:
Visa Opens World's Leading Payments Network to Independent Developers
"Authorize.Net Developer Center Enhanced to Facilitate Creation of Innovative Electronic Payments Applications"
http://developer.authorize.net/api
http://investor.visa.com/phoenix.zhtml?c=215693&p=irol-newsArticle&id=1486449

MobiNear RetailBox is already compatible with PayPal X.