curl --request PUT \
  --url https://discord.com/api/v10/users/@me/applications/{application_id}/role-connection \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "platform_name": "<string>",
  "platform_username": "<string>",
  "metadata": {}
}
'

{
  "platform_name": "<string>",
  "platform_username": "<string>",
  "metadata": {}
}