Can samba send API call to 3rd party app upon successful sales payment?

[Jesse]

Yes it is possible and its through javascript. I suggest you look here

https://forum.sambapos.com/t/integrators-graphql-api-guide/14047

and here

JScript Helpers and Functions

Compilation of the helpers that are available in JScript and [=expressions]. Background The script engine currently implemented in SambaPOS 5 is actually Microsoft JScript (similar to JavaScript) which is ECMAScript 3 (ES3 (Dec 1999)) compatible. As such, some functionality that you might find on the internet does not apply, such as new functionality added in ES5 (Dec 2009), ES6 (2015), or ES7 (2016). More information: https://blogs.msdn.microsoft.com/jscript/2007/10/29/ecmascript-3-and-…