curl -X GET "https://example.com/v1/email-domains/check-domain?domain=string"{ "domain": "string", "in_use": true, "existing_mx": [ "string" ], "suggested_domain": "string"}Cancel Verification
Withdraw a verification that has not been sent for review, or dismiss a rejected one. The draft is discarded either way. One that is under review cannot be cancelled: wait for the result; if it is rejected, dismiss it. An approved US SMS registration (`purpose=sms`) can be cancelled too: its numbers leave the campaign, the campaign is deleted at the carrier, and US-to-US texts from those numbers get 422 again. Its monthly fee is charged through the month of the cancellation, then stops. Telnyx bills at least 3 monthly fees from approval (`minimum_months` in GET /verifications/sms-fees), so a Telnyx registration cancelled sooner is still charged for 3 months.
Confirm Verification
Enter the code the carrier texted to confirm a person's US texting registration. Use it when the verification shows `confirmation: "code"`. On success the campaign is filed at once; poll GET /verifications/{id} until `approved`. A wrong or expired code is 422 on `code`; after five wrong codes, 429 until the carrier sends a new code (once a day). 409 when there is nothing to confirm.