Payment Service Provider (PSP)

A company that offers integrated payment acceptance services combining payment gateway, processing, merchant account, and often additional business tools in a single package, typically using a payment facilitator model with simplified onboarding and flat-rate pricing.

Payment Service Providers (also called payment facilitators or aggregators) streamline payment acceptance by eliminating the traditional multi-party structure of separate gateway, processor, and acquiring bank relationships. PSPs like Stripe, Square, PayPal, and Adyen enroll merchants under their master merchant accounts rather than requiring individual merchant accounts with acquiring banks. This aggregation model enables rapid onboarding (often within minutes), simplified underwriting requirements, no long-term contracts or early termination fees, all-in-one platforms combining payments with business management tools, and unified customer support for all payment-related issues.

PSPs typically charge flat-rate pricing where all transactions incur the same percentage and fixed fee regardless of card type. For example, Square charges 2.6% + $0.10 for card-present and 2.9% + $0.25 for online transactions. This pricing simplicity appeals to small businesses, startups, and merchants who want predictable costs without understanding complex interchange categories. PSPs often bundle value-added services like point-of-sale hardware, inventory management, invoicing, analytics, and accounting integrations into their platforms.

However, PSP pricing becomes less competitive as processing volume increases. The flat rates must account for expensive card types, meaning merchants who process many low-cost debit transactions effectively subsidize their premium card acceptance. Businesses processing $10,000+ monthly often benefit from traditional merchant accounts with interchange-plus pricing. Additionally, PSPs retain control over merchant funds and account access, meaning merchants face potential account holds, reserves, or terminations without the contractual protections of direct acquiring relationships. PSPs also typically limit customization, making them less suitable for complex payment needs like high-value transactions, specialized industry requirements, or advanced integration demands.

Optimize Your Payment Processing

Let Verisave analyze your merchant statement to identify hidden fees and misconfigurations related to payment service provider (psp).

Get a Free Audit

Related Terms

3D Secure

An authentication protocol for online card transactions that adds an additional verification layer between the cardholder and issuing bank, shifting fraud liability from merchants to card issuers when properly implemented.

ACH Payment

Automated Clearing House payment is an electronic bank-to-bank payment method that transfers funds directly between bank accounts through the ACH network, typically used for direct deposits, bill payments, and recurring transactions.

Acquirer

A financial institution that processes credit card payments on behalf of merchants, maintains merchant accounts, and facilitates the settlement of funds from card-issuing banks to merchant bank accounts.

Address Verification Service (AVS)

A fraud prevention tool that compares the numeric portions of a billing address provided during a transaction against the address registered with the card-issuing bank, returning match result codes to help merchants assess transaction risk.

Aggregator

A payment service provider that enables multiple merchants to process card transactions under a single master merchant account rather than each merchant having their own dedicated merchant account, common with services like Square, Stripe, and PayPal.