curl --request POST \
  --url https://us-central1-siro-prod.cloudfunctions.net/api-externalApi/v1/integrations/engagement-users \
  --header 'Content-Type: application/json' \
  --data '{
  "engagementId": "<string>",
  "userId": "<string>",
  "name": "<string>"
}'

{
  "id": "<string>",
  "engagementId": "<string>",
  "userId": "<string>",
  "name": "<string>",
  "organizationId": "<string>",
  "createdAt": "<string>",
  "updatedAt": "<string>",
  "integrationConnectionId": "<string>"
}