curl --request POST \
  --url https://sandbox-api.borderless.xyz/v1/auth/m2m/token \
  --header 'Content-Type: application/json' \
  --data '
{
  "clientId": "<string>",
  "clientSecret": "<string>"
}
'

{
  "accessToken": "<string>",
  "tokenType": "<string>",
  "expiresIn": 123
}