Send a one-time password (OTP) to a recipient. TextPeak generates the code, delivers it using the stream's configured OTP template and channel, and returns a request_uuid you reference when verifying.

• Fails with 402 if the account balance is depleted, or 429 if the recipient's OTP request cap is reached.
• Use retry: true to resend to the same recipient.

Authentication: stream token in the Authorization header (see Authentication in the API Overview).