Capital One Partner Account Summary API
The Capital One Partner Account Summary API provides approved partners consumer-permissioned access to account summary information such as balances, transaction history, and pending transactions in real time. Partners integrate it to keep customer-facing dashboards synchronized with Capital One account state. Access is OAuth 2.0 secured through DevExchange, tested in a sandbox and gated behind partner approval for production. The documentation is HTML-only on the DevExchange portal, with no downloadable OpenAPI definition available publicly.