Update User Data

curl --location 'https://api.returning.ai/v1/users/update' \
--header 'Content-Type: application/json' \
--data-raw '{
  "identifier": {
    "type": "email",
    "value": "old.email@example.com"
  },
  "updates": {
    "firstname": "Jane",
    "lastname": "Doe",
    "phone": "15551234567"
  }
}'