Glossary
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payment-gateway
E-commerce payment gateway: PSP definition for Stripe, PayPal, Adyen, vs payment methods, Shopify integration, and key merchant points.
Updated on
June 4, 2026
A payment gateway (payment gateway, PSP for Payment Service Provider) is the technical and financial service that transmits a transaction from the checkout to the banking networks: card authorization, capture, refund, and payout to the merchant. Stripe, PayPal, Adyen, or Shopify Payments play this role. Distinct from the payment methods visible to the customer, the gateway is the infrastructure behind "Pay by card" or "PayPal".
Summary
Simple definition: payment gateway
The payment gateway acts as the link between your store, the customer's bank (issuer), and your merchant account. It secures sensitive data and orchestrates the transaction flow.
Card payment actors:
Customer: enters card details or chooses a wallet.; Merchant: Shopify store, receives payouts.; Gateway / PSP: Stripe, PayPal, Adyen, Mollie.
Network: Visa, Mastercard, Cartes Bancaires.; Issuer: customer's bank.; Acquirer: merchant's partner bank for receiving payments.
Main functions of a gateway:
Authorization: verify funds and fraud risk.; Capture: debit the order amount.; Tokenization: replace card number with a token (PCI-DSS).
3DS / SCA: strong customer authentication (3D Secure).; Refund: full or partial refund from the admin.; Payout: transfer to the merchant's IBAN.
Useful distinctions:
Payment gateway vs. payment methods: the gateway processes; the method is what the customer sees (Visa, PayPal, Shop Pay).; Gateway vs. payment integration: the gateway is the service; the integration is the connection to Shopify (API, app, admin activation).; Gateway vs. online payment: online payment is the act; the gateway is the provider executing it.
Gateway vs. merchant account: the merchant account is the financial contract; the gateway often includes merchant onboarding (aggregator model).; Hosted gateway vs. embedded: redirect to a PSP page vs. integrated fields in the Shopify checkout.; Shopify Payments: Shopify's native gateway (Stripe infrastructure depending on the country), not a separate third-party app.
The benefits of a payment gateway for an online store
Without an active gateway, no card or wallet sales can be processed. This is a critical component of the conversion funnel.
Collection: transforming purchase intent into a paid order; Trust: secure checkout, PCI badges, consistent domain; International: currencies, local cards, country-specific payment methods; Compliance: Europe SCA, PCI-DSS, fraud prevention.
Costs: % fee + fixed per transaction rates impact margin; Ops: refunds, chargebacks, payout reports; Abandonment: bad gateway (slow redirect, refusal) = loss of turnover (shopping cart abandonment).
The choice of gateway must align target sales countries, currencies, payment methods expected by clients, and merchant costs. A French DTC SME does not have the same needs as a multi-country enterprise merchant.
Using with Shopify
Configuration in Settings > Payments (Shopify Help Center).
Shopify Payments: activate as a priority if eligible (Shop Pay included).; PayPal: one-click activation, Business account.; Third-party providers: list by country (Mollie, etc.).
Manual methods: non-automatic gateway (manual transfer).; Test mode: test cards before production.; Payouts: payouts tab and reports.
Shopify hosts the checkout: compatible gateways are displayed as embedded (card fields within the Shopify checkout), limiting external redirects. Conversion advantage vs redirecting to an unknown PSP domain.
Points to check during activation:
Complete gateway KYC (SIRET, identity, bank details).; Activate 2 to 3 relevant payment methods (card + PayPal + wallet).; Configure bank statement descriptor.
Test success, refusal, refund.; Document fees for margin calculation.
Shopify Plus: checkout extensibility for custom validations; the gateway remains the underlying transactional engine.
In brief
Payment gateway = PSP that processes checkout transactions (authorization, capture, refund, payout).; Examples: Shopify Payments, PayPal, Stripe, Adyen, Mollie.; Distinct from payment methods, integration, online payment, merchant account.
Challenges: conversion, PCI/SCA compliance, international, costs, fraud.; Shopify: Settings > Payments ; embedded checkout preferred.; 1 main PSP + complementary wallet ; test and monitor declines/chargebacks.
Associated terms, FAQ, and going further
Associated terms
Payment methods: options visible at checkout.
Payment integration: gateway ↔ store connection.
Merchant account: underlying acquiring contract.
3D Secure: authentication managed by the gateway.
Checkout: customer journey where the gateway intervenes.
FAQ
Payment gateway and payment method: what is the difference?
The payment method is what the customer chooses (card, PayPal, Apple Pay). The gateway is the technical provider that processes the transaction behind this choice.
Is Shopify Payments a gateway?
Yes. Shopify Payments is Shopify's native gateway for cards and Shop Pay. Depending on the country, the infrastructure relies on Stripe or other partners, with no third-party app to install.
Do I need multiple gateways on Shopify?
Often one main card gateway (Shopify Payments) + PayPal or a wallet is enough. Multiplying card gateways creates complexity without any conversion gain.
Gateway and payment integration: the same thing?
No. The gateway is the PSP service (Stripe, PayPal). The integration is the technical connection to your store (admin activation, API, webhooks).
Go further
Sources: Shopify Help Center (Payments), PSP documentation (Stripe, PayPal, Adyen).
In brief
Payment gateway = PSP that processes checkout transactions (authorization, capture, refund, payout).
Examples: Shopify Payments, PayPal, Stripe, Adyen, Mollie.
Distinct from payment methods, integration, online payment, merchant account.
Challenges: conversion, PCI/SCA compliance, international, costs, fraud.
Shopify: Settings > Payments; embedded checkout preferred.
1 main PSP + wallet complement; test and monitor declines/chargebacks.
Associated terms, FAQ, and going further
Associated terms
Payment methods: options visible at checkout.
Payment integration: gateway ↔ store connection.
Merchant account: underlying collection agreement.
3D Secure: gateway-managed authentication.
Checkout: journey where the gateway intervenes.
FAQ
Payment gateway and payment method: difference?
The payment method is what the customer chooses (card, PayPal, Apple Pay). The gateway is the technical provider that processes the transaction behind this choice.
Is Shopify Payments a gateway?
Yes. Shopify Payments is the native Shopify gateway for cards and Shop Pay. Depending on the country, the infrastructure relies on Stripe or other partners, with no third-party app to install.
Do you need multiple gateways on Shopify?
Often one main card gateway (Shopify Payments) + PayPal or wallet is enough. Multiplying card gateways creates complexity without conversion gains.
Gateway and payment integration: same thing?
No. The gateway is the PSP service (Stripe, PayPal). The integration is the technical connection to your store (admin activation, API, webhooks).
Going further
Sources: Shopify Help Center (Payments), PSP documentation (Stripe, PayPal, Adyen).
Enzo
June 4, 2026
