Send with header x-api-key. API docs
curl -X POST http://localhost:3000/v1/messages \
-H "x-api-key: wk_live_YOUR_KEY" \
-H "Content-Type: application/json" \
-d "{\"to\":\"918056515399\",\"message\":\"Hello\"}"
curl "http://localhost:3000/v1/messages?to=918056515399" \
-H "x-api-key: wk_live_YOUR_KEY"
1 token = 1 outbound API message. Reading is free.