Creation of API will take time and cannot be implemented pretty easy, You need to make sure the configurations are correct and also do testing using API tools like SOAP UI, PostMan.
Try to check if any app exchange tools are available which matches your requirement or you can use connected app's as well.
Review below links that can help you.
http://www.wadewegner.com/2013/03/creating-anonymous-rest-apis-with-salesforce-com/#:~:text=It's%20time%20to%20create%20the,to%20create%20a%20new%20class.&text=To%20access%20these%20APIs%20we,access%20to%20this%20Apex%20class.
https://trailhead.salesforce.com/en/content/learn/modules/marketing-cloud-developer-basics/create-an-api-request
Thanks,
Vinay Kumar
Thanks for the info , didnt get so many steps , is there anything easy method to do this , plz help
Creation of API will take time and cannot be implemented pretty easy, You need to make sure the configurations are correct and also do testing using API tools like SOAP UI, PostMan.
Try to check if any app exchange tools are available which matches your requirement or you can use connected app's as well.
Thanks,
Vinay Kumar