The starting point needs to be clear. Discover and Diners cards are not issued locally in Portugal, so they have no bearing on local consumer sales — the target is tourists, business travelers, and expatriates holding cards issued abroad, such as in the United States. Given Portugal's steady tourist inflow, this complementary demand is not negligible, and it is also worth noting that acceptance has broadened through network partnerships with BC Card, UnionPay, and others.

Priority candidates are travel-related industries such as hotels, tours, and car rentals, and global online services with a meaningful share of American customers. If you are targeting local Portuguese consumers, the main setup should be Multibanco, MB WAY, and major card brands rather than this method, with Discover as the final piece layered on top.

When a holder of a foreign-issued Discover or Diners card enters their card details, approval takes place through the Discover global network. Since the issuing country is mostly outside the EEA, PSD2 Strong Customer Authentication (SCA) is not always enforced, but 3DS authentication may still apply depending on the transaction combination, so it is safer to configure support for all authentication flows.

Within Hecto Financial's global card acceptance coverage, you can also consider whether to accept the Discover network. Since transaction volume for this complementary method tends to be small, it is efficient to confirm terms (settlement cycle, fees, currency options) together with your major card and local method contracts.

• Business registration country

  Confirm whether a contract is possible based on a domestic business registration

• Sales channels

  The integration method and priority vary depending on your online sales channel mix, such as owned store, marketplace, or mobile app

• Product categories

  Advance confirmation is needed on whether your products fall under restricted categories per Discover's merchant policy

• EU regulatory compliance

  Confirmation is needed on compliance with EU payment regulations such as PSD2 and SEPA (see official sources below)

Even for foreign-issued cards, transactions targeting Portugal are denominated and collected in euros (EUR) by default, and are then converted by Hecto Financial and settled to the domestic merchant in whichever currency — USD, KRW, or JPY — was chosen at contract time. If your travel business sees frequent booking-cancellation refunds, it is advisable to reflect in customer communications that the original-card refund processing time can be longer depending on conditions in the issuing country.

• Banco de Portugal (Bank of Portugal)Official information on Portugal's payment systems and related regulations. If this page's content differs from actual regulations, the official source takes precedence.