merge_contacts_request fields 'from' and 'into' are now required
BreakingBreaking change
This is a breaking change — integrations that rely on the affected behaviour will need updates before the change rolls out.
What changed
The merge_contacts_request schema now marks from and into as required fields. Clients that previously omitted either field (relying on them being optional) will now fail schema validation. This affects any integration that merges contacts without explicitly providing both identifiers.