Consent & import
Outbound sends require opted-in contacts. Imports should carry:consent_status(e.g.express)consent_method(e.g.web_form)consent_source(your system id)
contacts.import call.
Consent provenance required for compliant sends.
consent_status (e.g. express)consent_method (e.g. web_form)consent_source (your system id)contacts.import call.