Send SMS

Required JSON fields: to, sender_id, message, type. Optional: client_reference, callback_url, metadata.

POST /v1/messages
Authorization: Bearer sms_test_...
Idempotency-Key: 8f14e45f-ceea-467c-9daa-6e4d999bac48
Content-Type: application/json

{
  "to": "+233200000001",
  "sender_id": "TAYSEND",
  "message": "Your verification code is 482193",
  "type": "otp"
}

Same Idempotency-Key + same body replays the original response. Same key + different body returns 409 IDEMPOTENCY_CONFLICT. Batch send is POST /v1/messages/batch.