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Integrate AutoLetter programmatically into your systems. Create, manage and send advertising letters via our REST API.
Everything you need for integration
Standard HTTP methods and intuitive endpoints for rapid integration.
Secure authentication via API keys or OAuth2 for maximum flexibility.
Developer-friendly JSON responses with consistent error handling.
Create, pause, manage and analyze campaigns via API.
Test endpoints directly in your browser and explore all available parameters.
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How to start with the AutoLetter API
Register in the dashboard and request your API key.
Configure your API credentials for secure requests.
Test initial GET requests and explore the endpoints.
Integrate the API into your existing systems and workflows.
Practical examples in the most popular programming languages
Create a new campaign with the JavaScript SDK or directly via fetch.
const response = await fetch('https://api.autoletter.eu/v1/campaigns', {
method: 'POST',
headers: {
'Authorization': 'Bearer YOUR_API_KEY',
'Content-Type': 'application/json'
},
body: JSON.stringify({
name: 'Frühjahrsaktion 2025',
template_id: 'tpl_abc123',
recipients: {
list_id: 'lst_xyz789'
},
schedule: {
send_at: '2025-04-01T09:00:00Z'
}
})
});
const campaign = await response.json();
console.log('Kampagne erstellt:', campaign.id);All the features you need for integration
Import, validate and manage addresses.
Create, edit and preview templates as PDF.
Create, pause, resume and end campaigns.
Configure send times and campaign periods.
Real-time statistics and conversion tracking.
View costs and budgets transparently.
Real-time notifications for campaign events.
Billbee, CSV import and more connections.
Answers to the most important questions about the API
The AutoLetter API supports API key authentication via the Authorization header. You will receive your API key after registering in the dashboard.
Yes, the API is limited to 100 requests per minute. For higher limits, please contact our Enterprise team.
The API uses standard HTTP status codes. Error responses contain an ErrorDetails object with detailed information about the error cause.
The REST API can be used with any programming language that supports HTTP requests. We provide code examples for JavaScript, PHP and Python.
Yes, after registration you will receive access to a sandbox environment where you can test all endpoints risk-free.
The complete reference with all parameters and response schemas can be found in our interactive Swagger documentation at the top of this page.
Start now with the AutoLetter API and automate your direct mail advertising.