I am trying to update multiple contact records via the REST API that have an external Id CustomField__c
.
Is there any way to do this?
I've tried using Workbench, hitting
(POST) /services/data/v39.0/sobjects/Contact/CustomField__c
(PAYLOAD)
[{"LastName":"Jack",
"CustomField__c":"0402236",
"AssistantName":"Smith",
"Languages__c":"0402236",
"FirstName":"Jack"}]
But it returns back:
BAD_REQUEST
errorCode: BAD_REQUEST
message: CustomField__c is not an Id field.