How do we delete an existing Customer Contact at the Account level using FBDI or API?

Summary:

I have an integration which synchronizes Customer Data coming from a source system. There are scenarios where the source system sends information like Contact XYZ is no longer needed and hence should be removed from Oracle as well. I found a REST API to delete the relationship, but it still shows as Customer Contacts at the Account level, even though they are no longer part of any other site under the same account.

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Version (include the version you are using, if applicable):

Oracle Fusion R13 25c

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