Bizum, card, or bank transfer: which method to offer and what each one costs

When configuring payment methods for an e-commerce business in Spain, it can be tempting to turn on every available option or simply rely on traditional card processing. However, selecting the right payment mix directly influences three vital metrics: checkout conversion rates, net margins after fees, and the operational workload required for reconciliation and customer support.

In the Spanish market, three options dominate digital sales: debit and credit cards, Bizum, and bank transfers (standard or instant). Each operates on a distinct technical architecture, handles risk differently, and applies its own pricing structure.

Bank cards: universal reach and variable costs

Cards remain the indispensable baseline. They allow merchants to sell to both domestic and international shoppers, and they are the only one of the three options natively designed for recurring subscription billing without customer intervention on every billing cycle.

Card processing involves the cardholder's issuing bank, the card network (Visa, Mastercard), the acquiring bank, and the payment gateway. Under European PSD2 regulations, most online transactions in the EU require Strong Customer Authentication (SCA) and 3D Secure, requiring a biometric check or security code inside the buyer's banking app.

Regarding pricing, cards do not carry a single universal rate. Processing costs depend on whether you use blended pricing or an itemised model comprising the interchange fee (capped in the EU at 0.20% for consumer debit and 0.30% for consumer credit), scheme fees, and the acquirer markup. Deciding between a blended rate or interchange++ depends on business volume, especially because corporate cards and cards issued outside the European Economic Area are not subject to these caps and carry significantly higher costs.

The main drawback of cards is chargeback exposure: if a customer disputes a transaction or claims unauthorised use, their bank can retract the funds while the dispute is evaluated, typically levying an administrative fee against the merchant.

Bizum for e-commerce: local speed with no traditional chargebacks

Bizum has established itself as a leading payment solution in Spain. Originally created for peer-to-peer transfers linking mobile phone numbers to bank accounts (using the Iberpay clearing system), its e-commerce integration connects directly via payment gateways or commercial bank acquiring platforms.

The user journey is seamless: shoppers enter their mobile phone number on the payment page, receive a push notification from their banking app, and authorise the purchase using biometrics or a security PIN. There is no need to type in a 16-digit card number or an expiry date.

Key operational advantages include:

• High mobile conversion: eliminates the friction of searching for a physical plastic card.
• Zero traditional chargebacks: because transactions are account-to-account credit transfers authenticated directly within the user's online banking session, the conventional dispute mechanisms used by Visa or Mastercard do not exist. Refunds are only issued if the merchant explicitly approves them.
• Fast settlement: funds are typically deposited into the merchant account within one business day (or near-instantly, depending on the acquiring contract).

Bizum's limitations include geographic restrictions (it requires an account with a participating Spanish bank) and difficulties supporting variable recurring billing without manual customer intervention. In terms of pricing, acquiring services charge Bizum as a percentage of the transaction or a fixed fee plus a smaller percentage, framed within the gateway's broader processing fees and costs.

Bank transfers: high order values and low fees balanced against friction

Bank transfers remain common for business-to-business (B2B) commerce and high-ticket consumer goods (industrial equipment, high-end jewellery, specialised training). In these scenarios, percentage-based card processing fees would erode profit margins significantly.

There are two main operational models:

• Traditional manual transfer: the merchant provides an IBAN and an order reference number. The customer logs into their bank and initiates the payment; the order remains on hold until the funds arrive (typically 24 to 48 hours for standard SEPA credit transfers). This creates substantial friction for impulse purchases and requires manual bank statement reconciliation.
• Instant transfer or payment initiation (Open Banking): powered by banking APIs under PSD2, the customer authorises a real-time transfer directly from their bank interface inside the checkout flow, providing instant payment confirmation to release the order.

The processing cost of a standard incoming transfer is virtually zero for the merchant on most business accounts (excluding regular account maintenance), but hidden operational costs emerge from time spent on accounting reconciliation and customer input errors in the payment reference.

Practical criteria for checkout design

To balance operational costs and conversion rates in a Spanish online store, practical checkout design follows a few sensible guidelines:

• Essential foundation: offering both cards and Bizum covers over 90% of domestic consumer demand, noticeably cutting mobile checkout abandonment.
• For low-to-medium order values (under €150): Bizum and cards deliver the cleanest user experience paired with automated refund handling.
• For high order values or B2B sales (over €500): bank transfers (ideally automated or assisted) prevent disproportionate card processing fees and bypass consumer daily spending limits on cards and Bizum.
• For recurring subscriptions: cards remain the most reliable technical option with widespread gateway support for securely tokenising payment credentials.

Evaluating average order value and customer geography allows merchants to support only the payment methods that drive confirmed revenue, avoiding unnecessary integration overhead and simplifying daily cash reconciliation.