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Brandon COFFINBrandon COFFIN 

REST API relationship external ID

Hello,

I would like to get all the IDs of the contacts that are related to a specific account.
I found this : https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/dome_relationship_traversal.htm but I would like to do the same using an external ID like : https://instance.salesforce.com/services/data/v39.0/sobjects/Accounts/EXTERNALIDFIELD/EXTERNALID/Contacts?fields=ID

Is it possible ?

Thanks,
COFFIN Brandon