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Build on OpenCard

Card transactions, receipts, VAT, and line items — pushed to your systems in real time. Pick your integration path.

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EMS Integration

Expense Management Systems — orgs, card holders, webhooks. Receive card.transaction.* events in real time.

EMS API Reference

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

Card Issuers

Fetch digital receipts for cardholders via receipts.opencard.io.

Receipt Providers

Collect merchant receipts and deliver them to OpenCard for EMS 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.