Create Association

curl --request POST \
  --url https://services.leadconnectorhq.com/associations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'Version: <version>' \
  --data '
{
  "locationId": "string",
  "key": "student_teacher",
  "firstObjectLabel": "student",
  "firstObjectKey": "custom_objects.children",
  "secondObjectLabel": "Teacher",
  "secondObjectKey": "contact"
}
'

{
  "locationId": "string",
  "id": "ve9EPM428h8vShlRW1KT",
  "key": "student",
  "firstObjectLabel": "student",
  "firstObjectKey": "custom_objects.children",
  "secondObjectLabel": "Teacher",
  "secondObjectKey": "contact",
  "associationType": "USER_DEFINED"
}