> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://amer.developers.trustly.com/llms.txt.
> For full documentation content, see https://amer.developers.trustly.com/llms-full.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://amer.developers.trustly.com/_mcp/server.

# Core concepts

Before building your integration, familiarize yourself with Trustly's core building blocks — from the Establish Data object that configures every transaction to the webhook events that drive your backend logic.

The A2A payment model, Trustly Lightbox, and transaction lifecycle.

Configure merchant credentials, transaction details, and customer data.

How transaction IDs track authorizations and payment events.

Tokenized bank account information and stored credential security.

Configure return and cancel URLs for user redirects.

Receive asynchronous transaction status updates.

Trustly-provided UI strings for product names and messaging.