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Fintech Blog: Innovation and Digital Payments for E-Commerce

Discover the PayOk FinTech blog—your trusted source of knowledge on digital payments, financial technology, and industry news.

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Payment Gateway: What it is and how it works | PayOk

Payment Gateway: What it is and how it works | PayOk

A payment gateway is much more than the checkout form where a customer enters their card details. It is the technical and cryptographic bridge connecting your online store with the customer's bank, card networks, and clearing houses. Truly understanding how it works allows you not only to optimize conversion rates, but also to reduce fraud, effortlessly stay compliant with regulations, and make provider decisions based on real data rather than sales promises.
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How to avoid chargebacks in your e-Commerce?

How to avoid chargebacks in your e-Commerce?

Every month, numerous merchants in Spain exceed the maximum threshold of 0.9% in their monthly chargeback ratio, the operational limit established by the card schemes. This financial risk is global and growing: Visa alone recorded 11 billion dollars in disputes in the US during the last fiscal year, an upward trend that directly impacts the European market.
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Acquiring and agentic E-commerce in 2026

Acquiring and agentic E-commerce in 2026

Your business loses money every day due to declines you could avoid. I am not talking about cents: I am talking about between 5% and 15% of turnover that evaporates due to poorly configured payment infrastructure, static routing, and a payment gateway that does not speak the language of local issuing banks.
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Virtual POS: technical guide and conversion at PayOk

Virtual POS: technical guide and conversion at PayOk

Friction at the checkout destroys margins. If your gateway rejects legitimate operations, settles at T+7 (depending on risk), or your integration does not comply with PSD2 and PCI-DSS v4.0, you are paying an invisible tax on every euro you invoice. As the CEO of an entity regulated by the Bank of Spain, I process transactions daily. What I write here is what works and what destroys margins in production.
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