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Build on OpenCard

Real-time card transactions, digital receipts, VAT, and line items — delivered to your systems via webhooks.

Get API accessExpense Management System quickstart →

Expense Management System

Orgs, card holders, webhooks. Receive card.transaction.* events in real time.

Expense Management System API

Full API on api.opencard.io — TPAs, organizations, card holders, webhooks.

Card Issuers

Deliver transactions to EMS apps, or fetch digital receipts via receipts.opencard.io.

Receipt Providers

Collect merchant receipts and deliver them to OpenCard for Expense Management System enrichment.

Explore further

How it works

Data model, event flow, and what OpenCard handles.

Authentication

OAuth2 account_client credentials and scopes.

Environments

Sandbox vs production URLs.

Webhooks

Transactions, receipts, VAT, lifecycle events.

Digital Receipts API

receipts.opencard.io — publishers and callback requests.

Glossary

TPA, PDPC, card holder — every term explained.