Good day,

I don’t know of anyone who has used it but it’s possible.

Here are a few links that can help you to get started.

1. http://paymentsgateway.com/

K2 also consists of OOTB brokers to endpoints that payment gateways may expose.

1. http://help.k2.com/onlinehelp/k2blackpearl/UserGuide/4.7/default.htm#ServiceBrokers/EndPoints/EndPoi...
2. http://help.k2.com/onlinehelp/k2blackpearl/UserGuide/4.7/default.htm#ServiceBrokers/K2ODataServiceBr...
3. http://help.k2.com/onlinehelp/k2blackpearl/UserGuide/4.7/default.htm#ServiceBrokers/EndPoints/REST_E...

Use this links to also help you to connect you any SQL broker that store back end data to SQL

1. http://help.k2.com/onlinehelp/k2blackpearl/UserGuide/4.7/default.htm#ServiceBrokers/SQLServer/SQL_Se...

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Kind regards,

Dumisani