Update prepared message.
trackingOverride controls message tracking consent override behavior:
1 = no override; per-contact tracking consent applies.
2 = full override; open and link-click tracking are enforced for all recipients regardless of individual consent.
Any other value is rejected by this API.
On update, omit trackingOverride or send null to preserve the existing stored value; set trackingOverride to 1 explicitly to clear an active override.
Prepared message body.
trackingOverride controls message tracking consent override behavior:
1 = no override; per-contact tracking consent applies.
2 = full override; open and link-click tracking are enforced for all recipients regardless of individual consent.
Any other value is rejected by this API.
On update, omit trackingOverride or send null to preserve the existing stored value; set trackingOverride to 1 explicitly to clear an active override.