Hi Swapnil,
We have many Documentation and links in Mendix. I hope the below links help you out 

• https://video.mendix.com/watch/LxzKESFzqsrvNcGCY5YHCg
• https://docs.mendix.com/howto/integration/consume-a-rest-service/
• https://docs.mendix.com/refguide/integration/
• https://www.mendix.com/evaluation-guide/app-capabilities/service-consumption/