Quick Start
Make your first API call and send an email in under 5 minutes.
Authentication
Learn how to use API Keys and OAuth 2.0 to authenticate requests.
Transactional Email
Send order confirmations, password resets, and triggered messages.
Campaign Email
Build and send marketing campaigns to your contact lists.
SMS
Deliver transactional and promotional SMS to any mobile number.
Webhooks
Receive real-time delivery and engagement events in your system.
API Reference
Full endpoint reference with request/response schemas.
Rate Limits
Understand API rate limits and platform quotas.
Get started in 4 steps
1
Create an EffiLink account
Sign up at app.effilink.co for free. No credit card required to get started.
2
Get your API Key
Go to Settings → API Configuration → API Keys in the EffiLink dashboard to generate your API key. Store it securely — part of the key is only shown once.
3
Add a verified sender
Add and verify your sending domain or email address in Settings → Verified Senders before making your first send.
4
Send your first message
Call
POST /v5/transactional/mail/sends_customised with your API key in the ApiKey header. Check the Quick Start guide for a complete example.Explore by use case
Transactional Email
Triggered messages like receipts and alerts
Marketing Campaigns
Newsletters and promotional emails
A/B Testing
Optimize campaigns with split testing
Batch SMS
Personalized SMS at scale
Contact Management
Import and manage your audience
Sandbox Mode
Test integrations without sending real messages