When submitting
email_promo or sms_promo in a payload as a result of an end-user action (e.g. preference centre, sign-up form, in-app toggle), you must also include email_consent_updated_at and/or sms_consent_updated_at to record when the customer consented. These timestamps are required for compliance auditing and are propagated to connected comms platforms. Omit them only for backend corrections or admin overrides that do not represent a new consent decision. Send in UTC, ISO 8601 format.