SumUp Slovenia API Access via Open Banking

Merchants running a SumUp business account in Slovenia can pull balances and transactions into their own tools without wrestling with PSD2 certificates or bespoke banking APIs. open-banking.io gives you a single, standardised path to your SumUp data (BIC SUMUIE22) and covers 2,600+ EU and UK institutions the same way, so one integration serves your whole banking stack.

Because SumUp issues business accounts, this is aimed at merchants, finance teams and developers reconciling settlements, fees and payouts. Everything stays private by design: your data is decrypted locally with a key only you hold, and open-banking.io never sees it in the clear.

How to connect SumUp

Connecting happens entirely in 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 on your own device, so no one else can reproduce them.
  2. In the dashboard, choose SumUp and select the business account type.
  3. You're redirected to SumUp's own secure login to approve access (standard PSD2 consent).
  4. Once approved, your SumUp accounts sync into your dashboard automatically.

Consent lasts up to 180 days, after which you simply re-approve on SumUp's screen to keep the connection alive.

Access your data

Reading SumUp data programmatically is an optional developer step you take after the connection exists. On 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. Requests authenticate with the X-Api-Key header, and every response is decrypted locally with your own key. The API key alone only ever returns ciphertext; without your private key it stays unreadable, which is what makes the service zero-knowledge.

All of this — the dashboard connection, syncing and API access — costs around EUR 3/month, with no eIDAS certificate to buy or maintain.

Do I need a QWAC or PSD2 certificate?

No. open-banking.io is certificate-free; you authorise access directly on SumUp's login screen.

Can open-banking.io read my SumUp transactions?

No. It stores only your public key, so data can be encrypted to you but never decrypted on their servers.

Can I connect SumUp from the CLI?

No. The CLI and SDK only read or sync existing connections — you connect SumUp once in the dashboard, then read it programmatically.

Ready to start? Visit open-banking.io.