Updating a subform lookup record through an external field in the associated module

PUT {{api-domain}}/crm/v2/Contacts/extcontact2

Specify the external field's API name and its value in the lookup field JSON object of the Subform.

Request Body

{"data"=>[{"Subform_External"=>[{"Deal_Lookup"=>{"External_Deal_ID"=>"userdeal1"}}]}]}

HEADERS