curl --request POST \
  --url https://api.headlesscommerce.io/v1/oauth/token \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data grant_type=authorization_code \
  --data 'client_id=<string>' \
  --data 'code=<string>' \
  --data 'redirect_uri=<string>' \
  --data 'code_verifier=<string>' \
  --data 'refresh_token=<string>'

{
  "access_token": "<string>",
  "token_type": "Bearer",
  "expires_in": 3600,
  "refresh_token": "<string>",
  "scope": "<string>"
}