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ISO 3166-1 alpha-2 country for the number (default US). International numbers require usage-based billing. Tier 3/4 countries return 202 { status: "kyc_required", kycUrl } — the customer must complete KYC at that URL before the number is ordered. See GET /v1/phone-numbers/countries.
[optional][default to 'US']
number_type
String
Which of the country's offered number types to order (see `types[]` on GET /v1/phone-numbers/countries). Omitted = the country's default type, which is always the WhatsApp-safe choice. Capabilities, price, and KYC requirements are per (country, type): toll_free can never connect WhatsApp (400 when combined with connectWhatsapp:true), and wantsSms:true requires an SMS-capable type.
[optional]
connect_whatsapp
Boolean
A phone number is the unit; WhatsApp is one optional feature. Pass false to buy a STANDALONE number (Calls/SMS only): provisioning skips the Meta pre-verify/OTP steps and the number activates immediately. Omitted defaults to the WhatsApp provisioning path. WhatsApp can be connected to a standalone number later from the connect flow.
[optional][default to true]
wants_sms
Boolean
SMS capability is per-number, not per-country. Pass true to provision from the SMS-capable inventory pool so the number can actually text (see also GET /v1/phone-numbers/available with sms=true, and smsAvailable on GET /v1/phone-numbers/countries).
[optional][default to false]
purchase_intent_id
String
Optional idempotency key. Send the same value when retrying a purchase: if a number was already bought under this key, the API returns { status: "already_purchased", numberId, phoneNumber } instead of provisioning a second number. Generate a fresh key for each genuinely new purchase.
[optional]
allow_multiple
Boolean
Any second purchase within 10 minutes of a previous one is rejected with 409 code PURCHASE_VELOCITY as duplicate protection. Pass true to confirm the additional purchase is intentional (e.g. bulk provisioning).