post https://api.clientsuccess.com/v2/client/upsert
INSERT or PATCH. Uses the ExternalSystemId to find client
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Response
INSERT or PATCH. Uses the ExternalSystemId to find client
xxxxxxxxxx
curl --request POST \
--url https://api.clientsuccess.com/v2/client/upsert \
--header 'accept: */*' \
--header 'content-type: application/json'
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