Opel Mastercard API Access & Open Banking (Sweden)

Your Opel Mastercard keeps a running record of every purchase, instalment and repayment on your Swedish card account. open-banking.io lets you reach that record on your own terms: a zero-knowledge, certificate-free bridge to Opel Mastercard and 2,600+ other EU and UK banks, where the data is decrypted on your device with a key only you hold. There is no eIDAS certificate to buy and no bank sandbox to register for.

Opel Mastercard is offered in Sweden as a personal card account. It has no published BIC (BIC n/a), and access consent under PSD2 lasts up to 180 days before you re-approve it.

How to connect Opel Mastercard

Connecting happens entirely inside the open-banking.io dashboard — there is no API call, code or key involved in this step.

  1. Sign up for open-banking.io and set your encryption passphrase. Your keys are generated locally on your device, so nobody else can reconstruct them.
  2. In the dashboard, search for Opel Mastercard and choose the personal account type.
  3. You are redirected to Opel Mastercard's own secure login to approve access (the standard PSD2 consent screen).
  4. Once approved, your card account and transactions sync back into your dashboard, ready to view.

Because consent runs for up to 180 days, you refresh the connection roughly twice a year with the same simple redirect.

Access your data

Reading the data programmatically is an optional step after the account is connected. Open the Developers page, create an API key and export a credentials.json — this bundles the API key together with your private decryption key. From there use the CLI (openbanking accounts, openbanking transactions, openbanking sync), an SDK, or the REST API. Every request carries the X-Api-Key header, and each response is decrypted locally with your own key. The API key alone only ever returns ciphertext, because open-banking.io stores just your public key and can never read your data.

All of this is included for about EUR 3/month.

Does open-banking.io see my Opel Mastercard transactions?

No. It is zero-knowledge — it holds only your public key, and decryption happens on your device.

Can the CLI connect my card for me?

No. Connecting is a dashboard-only step with a redirect to Opel Mastercard. The CLI and SDK only read or sync connections that already exist.

How long does access last?

Up to 180 days per consent, after which you re-approve on Opel Mastercard's login screen.

Start at open-banking.io.