How to start sending messages with MessageFlow

Step 1 — Create your account

1. Sign up. Head to messageflow.com and create an account. Onboarding is self-service, so you can start immediately. New accounts include 30-day trial: 100 SMS + 100 emails to test with.
2. Grab your keys. Open the dashboard and copy your credentials. MessageFlow uses Two API-key headers generated in the panel (Account > Settings > API): Authorization (128-character key) and Application-Key.
3. (Optional) Use the sandbox. MessageFlow offers a test environment, so you can validate your integration before sending live traffic.

Step 2 — Send your first SMS

The fastest path is a single API call. Drop in your credentials and a destination number, then run this from your terminal:

curl -X POST https://api.messageflow.com/v2.1/sms \
  -H "Authorization: YOUR_API_KEY" \
  -H "Application-Key: YOUR_APPLICATION_KEY" \
  -H "Content-Type: application/json" \
  -d '{"sender":"YourCompany","message":"Hello world!","phoneNumbers":["+48111222333"]}'

The request hits https://api.messageflow.com/v2.1/sms. A 2xx response means MessageFlowhas accepted your message for delivery — you should see it arrive within seconds.

Step 3 — Go native with an SDK

Once the raw call works, switch to an official SDK for retries, typing and error handling.MessageFlow ships SDKs for .Full reference lives in the MessageFlow documentation.

What's next

• Add more channels. MessageFlow also supports WhatsApp, RCS, Viber, Email — reuse the same account and credentials.
• Mind compliance. MessageFlow is GDPR, ISO 27001, SOC 2 aligned, with EU and no US data residency options.
• Compare before you commit. See how MessageFlow stacks up on the provider table or in a head-to-head comparison.