@siddharthB4890  Although there isn't a direct api/v1/... endpoint to navigate to the previous Multi-step form step within a stage, it is possible to use the api/application/v2/navigation_steps/previous endpoint to do this.  There are a bunch of caveats with how this is used:

1) Both the application and api service package must be set to the same Authentication Type (or you must take care to pass the proper authorization header type expected to each)

2) The viewType argument for the api/application/v2/navigation_steps/previous endpoint must be set to "none" when you are invoking this against a server rendered application (Sections-based)...as the v2 api is expecting to be used agains Views-based apps.

3) You will want to save any edited content within the current flow action prior to invoking the "previous" endpoint  

Also, the "navigation" and "actionButtons" properties within the api/v1/assignments/{id} endpoint returns good information on when the previous (or next) buttons should be displayed.  

The React and Angular Starter Packs now use this technique to accomplish support for Previous action using this above technique.  The Cable Connect sample application provided with the Starter Packs have a Customer flow utilized by operators such as customer.cableco, which are within the CableConnect:Customers access group to demonstrate this functionality.