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Natasha Ali 3Natasha Ali 3 

HOW to use Email as unique identifier in an API??

I'm developing an API and need help with using the email address on the record as the unique identifier in both Salesforce and the third party service. Salesforce will consume the REST API but I needed to know how I can get the http callout to choose the record in the external system based on the email address. (How to match the record in SF to external system using the email address??)

ANY help is much appreciated :)
Many Thanks,
In Salesforce,you can define a field as External Id (Set this field as the unique record identifier from an external system).