Currently all the options avaliable on wix to accept payements are paused by indian governement and wix doesn’t support any other providers so is it possible to integrate a third party app using api with the same functionality as the current default opitons.
Of course it should be possible, but it is surely not a task to be done by unexperienced coders.
For Instamojo integration, you can use this app: Instamojo Pay Button | Wix App Market | Wix.com