How much to charge for a payment integration
How much to charge for a payment integration comes down to the money that will move through it. The client wants to take payments on their site or app: a one-off purchase, a deposit, a subscription, a membership, invoices paid online. Every sale they make will pass through what you build. Find out what that revenue is worth to them, and what a day of failed or missing payments would cost, then price against that and itemize the parts that drive effort: flows, webhooks, failure handling, refunds and testing.
Claude Code makes the code quick. A hosted checkout, a webhook endpoint and the logic that marks an order as paid are work it does well, and adding payments to a Claude Code build walks through how. That is exactly why pricing by hours undersells you. What takes the time is everything around the happy path: a card declined on renewal, a customer refunded who still has access, a webhook that arrives twice, a plan change halfway through a month. Build the quote around those.
Find out what is at stake before you quote
Do not quote from the number of buttons. Ask four questions in the first call: what they sell and how people pay for it today, which payment types they need (one-off, deposits, subscriptions, invoices), what has to happen in their business when a payment lands or fails, and roughly how much revenue they expect to run through it. The last answer sets your price more than anything else.
Three kinds of payment integration clients and what to price against
| Client | What they need | Price against |
|---|---|---|
| Small business taking payments online for the first time | A checkout for a few products or a deposit on a booking, with a receipt and an order record | Staff time spent chasing payments by hand, and sales lost to friction |
| Subscription or membership business | Recurring plans, trials, upgrades and downgrades, failed renewals and access that switches on and off with payment | Recurring revenue that leaks every month when renewals fail quietly or access is wrong |
| Business moving off a clunky payment setup | Moving existing customers and plans to a new flow without double charging or losing anyone | The revenue at risk during the switch, and the support load if it goes wrong |
If they cannot tell you how their payments should work, that is your answer: sell a paid discovery first and quote the build after. Paid discovery for AI projects covers how to sell that, and client discovery questions before you quote has the questions.
The CCC Payment Integration Quote
Six parts of a payment integration quote
| Part | What it prices | Question to ask the client |
|---|---|---|
| Payment flows | Each way a customer can pay: one-off, deposit, subscription, invoice, with the checkout and confirmation for each | Which ways do customers need to pay, and which matter most? |
| Webhooks and records | Listening for payment events and keeping orders, accounts and access in sync with what actually got paid | What should happen in your system the moment a payment succeeds or fails? |
| Failed payments | Declined cards, expired cards, retries and what the customer sees and receives | What do you want to happen when a renewal fails? |
| Refunds and changes | Refunds, cancellations, plan changes, coupons and what happens to access in each case | Who issues refunds today, and what should a refund switch off? |
| Testing | Running every path in test mode, including declines and duplicate events, before live keys go in | Who on your side will test the checkout and sign it off? |
| Monitoring window | Watching live payments after launch and fixing anything that does not match | Who should hear about a failed payment or a mismatch, and how fast? |
Webhooks are your anchor line. A checkout that takes money but does not reliably update the client's records is worse than no checkout, because the business finds out from angry customers. Quote the work that makes paid mean paid everywhere in their system as its own line, and explain in one sentence why it matters.
Failed payments and refunds always get their own lines too. This is where payment jobs run over. The first version handles the customer who pays. The real business also has the customer whose card expires, the one who wants a refund after a week, and the one who upgrades on the 20th. Quote those as real work, because they decide whether the owner trusts the numbers.
Agree what done means in writing
Payment jobs end in arguments when nobody wrote down which cases are covered. The owner expects every situation to just work, including ones they never mentioned, like partial refunds or customers paying in another currency. Put the list in the proposal: which payment types, which events update their system, what happens on failure, how refunds work, and which cases are out of scope.
My take: promise tested paths, not perfection. Agree a short list of test scenarios, such as a successful payment, a declined card, a refund and a cancelled subscription, and have a named person on their side run them in test mode and sign off before live keys go in. Once they have signed off, a new case they forgot to mention is a change request. How to handle the "guarantee results" objection covers what to say when they push for more.
Keep the account, keys and customer data in the client's name
The payment provider account belongs to the client, in their business name, with payouts to their bank. You get added as a team member with only the access you need. Live keys live in their hosting settings, never in the code and never on your laptop after the job. Say in writing when your access ends.
I recommend using the provider's hosted checkout or payment fields so card numbers never touch the client's server. That keeps the build simpler and keeps the client out of a whole category of risk. If they ask about tax, invoicing rules or compliance in their country, ask early and get their answer in writing. Those decisions are theirs with their accountant or advisers. Is Claude Code safe for client work covers how to talk about it.
Always quote the monitoring window
Payment problems show up when real customers pay. A renewal fails and access does not switch off, a webhook is missed during a hosting blip, a coupon applies twice. If you have not quoted for that, you fix it for free while the owner wonders whether money is going missing.
Put a fixed monitoring window in the first proposal, next to the build price. Say what it covers: watching live payments, reconciling them against the provider's dashboard and fixing anything that does not match. Say what it does not cover: new plans, new payment types and pricing changes. If they want ongoing help after that, offer a retainer. How to price a maintenance retainer covers the structure.
How to present the payment integration quote
- Lead with the outcome in the owner's words. One line on what is at stake, such as customers paying online and every payment showing up correctly in their system, then the price.
- Offer three options. A starter version with one payment type and a hosted checkout, a standard one that adds webhooks, failed-payment handling and refunds, and a full one with subscriptions, plan changes and a longer monitoring window. Most owners pick the middle one when it is clearly the best value.
- Itemize it. Payment flows, webhooks, failed payments, refunds and testing, then the monitoring window as its own line. Itemized quotes get trimmed, not rejected.
- Take a deposit and tie the rest to milestones, with sign-off of the test-mode run as one of them. How much deposit to charge and how to structure milestone payments cover the schedule.
And skip hourly. Claude Code makes the checkout code fast, so an hourly rate turns that speed into a pay cut. Why I stopped charging hourly for AI builds covers why. If payments are part of a booking flow, see how much to charge for a booking system, and if paying customers need a place to log in, see how much to charge for a client portal.
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Frequently asked questions
How much should I charge for a payment integration?
Price it on the revenue that will run through it and what a failure would cost the business, not on the hours to add a checkout. Charge for payment flows, webhooks, failed payments, refunds and testing as separate lines, and quote a monitoring window after launch.
Why do some payment integrations cost more than others?
Because of the cases around the happy path. A single product with a hosted checkout is quick. Subscriptions with trials, upgrades, failed renewals, refunds and access that has to switch on and off with payment take far more work and testing.
Should I charge extra for subscriptions?
Yes. Recurring billing adds failed renewals, plan changes, cancellations and access control, and each needs its own handling and test cases. Quote it as its own option or line instead of folding it into a basic checkout price.
What should a payment integration proposal include?
Which payment types are covered, which events update the client's system, what happens when a payment fails, how refunds work, the test scenarios they will sign off, who owns the account and keys, what the monitoring window covers, and what is out of scope.
Who should own the payment account?
The client. The account is in their business name with payouts to their bank, live keys sit in their hosting settings, and you are added as a team member with limited access that ends on a date agreed in writing.
Last reviewed by Duncan Rogoff on November 6, 2026
