curl --request GET \
  --url https://api.example.com/environments/settings \
  --header 'Authorization: Bearer <token>' \
  --header 'x-environment: <x-environment>'

{
  "handles": {
    "invoicePrefix": "<string>",
    "customerPrefix": "<string>",
    "subscriptionPrefix": "<string>"
  },
  "invoice": {
    "seed": 123
  },
  "paymentTerm": {
    "defaultTerm": "<string>"
  }
}