Get the regulatory information needed to buy a phone number, for one specific number or for a country and number type. Prefer phoneNumber: the response is then exactly the list the purchase of that number validates against. Pass each requirementTypes[].id back as requirementType in regulatoryRequirements on POST /v1/phone-numbers.

For phoneNumber, the requirements of that exact number are returned. When they cannot be resolved for the number itself, the list for its country and type is returned instead, and the purchase uses the same list. An empty items array means the number needs no regulatory information. If the requirements cannot be retrieved at all, the response is 502 requirements_unavailable, never an empty list.

URL-encode the + of phoneNumber as %2B. An unencoded + is also accepted.

{
  "items": [
    {
      "countryCode": "DE",
      "phoneNumberType": "local",
      "action": "ordering"
    }
  ]
}