Payment Processor
Every online sale rides on a payment processor. For one-time purchases the choice barely matters day to day; for subscriptions it matters enormously, because the processor determines how stored payment methods behave — and stored payment methods are the substrate of recurring revenue.
A payment processor is the company that moves a payment from the customer’s bank or card to the merchant’s account — authorizing the charge, routing it through the card networks or ACH, and settling the funds.
What a payment processor actually does
- Authorization — checks with the customer’s bank that funds exist and the card is valid, in about a second.
- Routing — passes the transaction through card networks (Visa, Mastercard) or the ACH network.
- Settlement — moves the money into the merchant’s account, typically 1–3 business days later.
- Ancillary services — fraud screening, currency conversion, chargeback handling, and card vaulting/tokenization.
Processor vs. gateway vs. acquirer
The terms blur together because modern providers bundle all three roles:
| Role | What it does | Classic example |
|---|---|---|
| Gateway | The checkout-facing interface that captures payment details | Authorize.net |
| Processor | Executes authorization, routing, settlement | Fiserv, Worldpay |
| Acquirer | The merchant’s bank that receives the funds | Acquiring banks |
| All-in-one | Gateway + processor + acquiring in one API | Stripe, Adyen, Shopify Payments |
Why the processor matters for subscriptions
Three processor capabilities decide how much recurring revenue survives:
- Tokenized card vaulting — recurring payments charge stored tokens; how portable those tokens are determines whether you can ever switch platforms without losing subscribers.
- Network account updater — automatically refreshes expired/reissued card numbers, preventing a large share of involuntary churn before it happens.
- Decline codes — granular decline reasons let dunning systems retry intelligently instead of blindly.
On Shopify, processing is handled by Shopify Payments (or a third-party gateway), and subscription apps like RecurX charge the vaulted methods through Shopify’s native subscription APIs — which is also why RecurX migrations preserve payment tokens: they live at the platform level, not inside the app.
What payment processing costs
Online card processing in the US typically runs around 2.9% + $0.30 per transaction at standard rates, with volume discounts at scale; ACH runs far cheaper (~0.5–1%, often capped). This is separate from any subscription-app transaction fee — one reason zero-fee subscription tooling matters: processing already takes its cut, and a second percentage on top compounds against margin.
Frequently asked questions
What is a payment processor?
The company that executes a payment: it authorizes the charge with the customer’s bank, routes it through card or ACH networks, and settles the funds to the merchant. Stripe, Adyen, and Shopify Payments are common examples that bundle gateway and processing together.
What is the difference between a payment gateway and a payment processor?
The gateway is the checkout-facing layer that securely captures payment details; the processor executes the transaction behind it. Modern providers like Stripe and Shopify Payments combine both, which is why the terms are used interchangeably.
What payment processor does Shopify use?
Shopify’s built-in option is Shopify Payments (powered by Stripe’s infrastructure), and Shopify also supports dozens of third-party gateways. Subscription apps charge the payment methods vaulted by whichever processor the store uses, via Shopify’s subscription APIs.
How do payment processors handle recurring payments?
They tokenize the payment method at first authorization and let the merchant charge the stored token on schedule. Good processors add network account-updater services and detailed decline codes, which recover or prevent many failed renewals.
Related terms
- Recurring PaymentsA recurring payment is a charge collected automatically from a customer on a fixed schedule — weekly, monthly, or annually — using stored payment credentials, until the customer cancels or the agreement ends.
- ACH BillingACH billing is the practice of collecting payments by debiting a customer’s bank account directly through the Automated Clearing House (ACH) network, instead of charging a credit or debit card.
- Automatic PaymentsAn automatic payment is a charge that a business collects from a customer’s stored payment method on a pre-agreed schedule — no action required from the customer at billing time.
- DunningDunning is the automated process of recovering failed subscription payments — retrying declined charges on a schedule and sending reminder emails or SMS with card-update links — to prevent involuntary churn.
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