By posting to this endpoint it allows users to append data to a lead record (not overwrite).
https://{enterprise}.cvtr.io/ajax/lead-append/{leadHash}
Example CURL
curl --location --request POST 'https://{enterprise}.cvtr.io/ajax/lead-append/{lead hash}' \
--form 'some_data=sdata' \
--form 'more_data=mdata' \
--form 'even-more_data=emdata'