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An online payment service enables or supports electronic payments between a payer and a payee over the internet or another remote channel. The term covers different jobs: transmitting payment instructions, routing transaction data, processing or acquiring transactions, and in some cases providing an electronic-money account. A payment gateway, processor, and payment service provider are not automatically the same thing; the provider’s actual role determines what it does with a transaction and, potentially, with funds.
What an online payment service does
At its simplest, an online payment service helps a person or business make or accept a payment electronically. It may support the initiation of a payment, pass transaction details between participants, execute or acquire a transaction, or provide an account or wallet in which electronic money is held. The label alone does not reveal which of these functions a provider performs.
In legal and regulatory contexts, “payment service” can have a defined scope that varies by jurisdiction. For example, the UK Financial Conduct Authority lists functions including operating payment accounts, executing payment transactions, issuing payment instruments, acquiring transactions, money remittance, account-information services, and payment initiation. That is a UK regulatory example, not a universal definition. FCA: Payment Services Regulations 2017 and Electronic Money Regulations 2011
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How an online card payment works
A typical card purchase involves the customer, merchant, processor, card network, and card issuer. The request is authorized first; settlement, through the relevant financial institutions and network, follows later. The exact participants and sequence can differ by network and provider arrangement. The Financial Consumer Agency of Canada outlines this card-payment flow in its merchant guidance. How card payment transactions work
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- The customer starts the payment. They enter card details at checkout or choose a card saved in a digital wallet.
- The merchant sends transaction details. The merchant’s online payment system passes the request to its processor.
- The request is routed for authorization. The processor sends purchase details through the applicable card network to the card issuer.
- The issuer responds. The issuer checks the transaction and returns an approval or decline through the route used for the request.
- The transaction is settled. Transactions are later grouped for settlement. Funds move through the relevant institutions and network to the processor and merchant, according to their arrangement.
Authorization is not the same as the later movement of funds. A provider may participate in routing or processing without itself holding the customer’s or merchant’s money.
How gateways, processors, and other providers differ
These terms describe roles in a payment chain, but their use can vary by provider and market. Check what a specific service actually does rather than relying on its product label.
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| Term | Typical role | Important distinction |
|---|---|---|
| Payment service | A broad industry or regulatory category for payment transactions and related functions. | Its legal meaning and authorization requirements depend on the jurisdiction and the activities performed. |
| Payment gateway | Technology that routes and facilitates online payment processing. | The Reserve Bank of India’s 2019 discussion paper described a gateway as routing and facilitating processing without handling funds. This distinction reflects that paper’s description; it should not be taken as a universal definition of every product marketed as a gateway. RBI discussion paper (2019) |
| Payment processor | Processes or routes transaction details and may participate in settlement arrangements. | In the Canadian card-payment walkthrough, the processor routes purchase details via the network to the issuer and participates in settlement; the exact arrangement depends on the service. |
| Payment aggregator or facilitator | An intermediary arrangement that can organize or procure acquiring services for merchants. | Definitions differ by market. The RBI discusses aggregators separately from gateways, while the Reserve Bank of Australia describes a payment facilitator as a PSP that arranges or procures acquiring services for merchants. RBA glossary of key terms |
| Electronic money institution (EMI) | Provides electronic money, commonly held in an online account, wallet, or prepaid card. | The provider type can matter when understanding applicable protections; the rules depend on where the service operates. FCA: Using payment service providers |
What to check when choosing a service for a business
For a merchant, the useful question is not simply whether a company calls itself a payment service provider. Establish which methods it supports, where it sits in the payment chain, and what the contract says about authorization, settlement, fees, and responsibility for handling funds.
- Payment methods: Confirm which card, wallet, or other payment methods the service accepts for your customers and markets.
- Provider role: Determine whether it only routes data or also processes transactions, provides acquiring, aggregates merchants, or handles funds.
- Authorization and settlement: Ask how payment decisions are returned and how settlement is arranged for your account.
- Fees: Review the agreement rather than assuming a standard rate. The Canadian agency notes that processor fees can vary by plan and may depend on card brand, card type, or transaction type.
- Local protections and authorization: Check the rules applicable where the service operates and what protections attach to that provider type and activity. A UK regulator’s categories, for example, should not be assumed to apply elsewhere.
Remote payments and legal scope
“Online” commonly refers to a payment made through a website or app, but legal frameworks may use more specific terms. The European Banking Authority’s PSD2 interpretation addresses the definition of an electronic remote payment transaction in the EU framework; it does not establish one global legal meaning for every online payment service. EBA: Definition of an electronic remote payment transaction
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Accordingly, whether a provider must be authorized, and which consumer protections apply, depends on the jurisdiction and on what the provider actually does. A service that routes payment data should not automatically be described as holding funds, and a provider that offers an account or acquires payments may have a different role and regulatory treatment.
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