OptionalapplicationkeyOptionalcapabilityindicates the DID capability that needs to be assigned to the chosen application. Valid values are 'voice' and 'sms'. Please note that the DID needs to support the selected capability.
OptionalnumbersThe phone number or list of numbers in E.164 format.
indicates the application where the number(s) will be assigned. If empty, the application key that is used to sign the request will be used.