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Please have a look at these links:
https://www.forcetalks.com/blog/apex-web-services-and-callouts/
https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_callouts.htm
https://trailhead.salesforce.com/en/content/learn/modules/apex_integration_services/apex_integration_rest_callouts
I hope you find the above solution helpful. If it does, please mark as Best Answer to help others too.
Thanks and Regards,
Deepali Kulshrestha