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Devendra KeshariDevendra Keshari 

How to Integrate Mercury5 's REST API with salesforce

pconpcon
Pretty much any REST API can be accessed by using Apex Callouts [1].  I would recommend going over the integration Trailhead [2] for more information about where to start.  If you have any specific questions, please provide more information about what issue you are facing, and any code that you have tried.

NOTE: When including code please use the "Add a code sample" button (icon <>) to increase readability and make referencing code easier.

[1] https://developer.salesforce.com/page/Apex_Web_Services_and_Callouts
[2] https://developer.salesforce.com/trailhead/module/apex_integration_services