curl --request POST \
  --url https://api.example.com/payments/customers \
  --header 'Content-Type: application/json' \
  --data '
{
  "metadata": [
    {
      "key": "<string>",
      "value": "<string>"
    }
  ],
  "name": "<string>",
  "test": true
}
'

{
  "id": "<string>"
}