curl -X POST "https://api.joinformal.com/core.v1.GroupService/DeleteUserGroupLinkByUserIdAndGroupId" \
  -H "X-API-KEY: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "example": "value"
  }'

{
  "userId": "<string>",
  "groupId": "<string>"
}