Implement Payment Gateway in Appian using iFrame

we cannot have similar functionality as we did in portal as we cannot perform save action on safeLink, which is the only way to point external sources.
One way of doing same is by providing a safeLink to payment gateway on task and on recieving payment response from gateway (usually it will be a web service call to Appian or Appian process will be triggered by some messages) complete the task using smart service which is having payment link. This kind of approach will help us to keep link available until user completes payment.

Appian should consider providing save option on safeLink too to address these kind of requirements.

@rishij may i know which Vendor gateway are you trying to integrate in Appian, as per my understanding Appian do not have direct Payment gateway integration possibility as of now, as we are restricted not to have HTML & JSP's but when we talk about Payment Gateway, You need to have (or) Open a HTML/JSP Page in client Machine where we need to provide the details about payment but relative details such as Amount etc.. must be required to send from Appian to REST Service as it's body.

So try to create a REST Service which can return Viewable as Return Type, which will cause an HTML Page to open, invoke this service using WEB-API, so by this way partly you can achieve this requirement

As this post is over three years old, there have been a lot of changes to the Appian base product in that time. I would suggest you look into current SAIL components such as the web content component and the integration objects available in the current version of Appian.

https://docs.appian.com/suite/help/19.4/Web_Content_Component.html

https://docs.appian.com/suite/help/19.4/Integration_Object.html