curl --request POST \
  --url https://api-sandbox.argyle.com/v2/user-tokens \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "user": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

{
  "user_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJjbGllbnRfaWQiOiIxNDRhMTRkNJ04YzEzLTQzZGYtOTI4Ni01OWY4NjFkOWEyMDIiLCJleHAiOjE2NzgzOTUwMTEsImZpZCI6ImMyNzFhODRlLWM2MjQtNDNkYS05OGMyLTQzODZkNTk1OWQ4YiIsImlhdCI6MTY3ODM5MTQxMSwiaXNzIjoiYXJneWxlLWNvcmUtYXV0aC1kZXYiLCJqdGkiOiI4ZTk1MTBmNC00YzVlLTRlOTAtOTIyNy1kNjg2MTk3MmMxOTAiLCJzdWIiOiIwMTg2YzRiOC04ZmExLTYyYjMtNDlkZi05NGIzZTE4Y2E4YTciLCJ1c2VyX2lkIjoiMDE4NmM0YjgtOGZhMS02MmIzLTQ5ZGYtOTRiM2UxOGNhOGE3In0.oLrxtzfNHG1RZ85Z4q7VUiv2-kufXmMINJFHeRIjvWo"
}