curl --request POST \
  --url https://api.example.com/discord/user/link \
  --header 'Content-Type: application/json' \
  --data '
{
  "id": "<string>",
  "is_primary": true,
  "snowflake": "<string>"
}
'

{
  "id": "<string>",
  "is_primary": true,
  "snowflake": "<string>"
}