Payment processor integration
that charges the right amount.
A checkout is the one part of a website where a bug costs money directly. We build checkouts that set prices on the server, refuse what they shouldn't accept, and carry every payment into your CRM and your books — whether you run on Stripe or a high-risk gateway.
Begin the ConversationPayment processor integration connects your website's checkout to the processor that moves the money — Stripe, a high-risk gateway, or whatever you're approved for — and then carries each payment into your CRM and accounting. Axesris is a Stripe integration developer in Torrance: we build the checkout, the webhooks, and the reconciliation. The merchant account stays yours.
Two things get confused constantly, so let's separate them. A merchant account is the relationship that lets you accept cards. The processor underwrites your business — what you sell, your volume, your refund and chargeback history — and decides whether to approve you and on what terms. That relationship belongs to you. A payment integration is the software that connects your site to that account: the checkout page, the price calculation, the confirmation, and what happens after the money moves. That's what we build.
We don't promise approval, and you should be wary of anyone who does. What we can do is make the integration correct for whatever you're approved on, and build the site so it presents your business clearly to an underwriter. If your business is in a category mainstream processors treat as high-risk — because of what you sell, how you bill, or your chargeback exposure — the payment gateway integration has to work with the gateway you actually have, not the one that's easiest to code against.
The integration itself comes down to a handful of decisions that matter more than which processor you pick. Where is the price calculated — in the browser, where anyone can change it, or on the server? How does the site learn a payment succeeded — from a redirect a customer can fake, or from a signed webhook the processor sends directly? What happens to a cart that's been sitting open for a week while your prices changed? And once the payment clears, who updates the CRM, marks the invoice paid, and releases the order?
Get those right and the checkout is boring, which is what you want. Get them wrong and you find out from a customer, an accountant, or a chargeback.
Payment gateway integration, from cart to reconciled books.
The browser sends product codes and quantities — never prices. The server looks up the current price, builds the charge, and refuses a cart whose prices have gone stale instead of charging an old number. Apple Pay and Google Pay where your processor supports them.
Stripe Checkout or embedded payment forms, built so card details go straight to Stripe and never touch your server. Required terms and acknowledgements recorded with each order, so you can show what the customer agreed to.
Integration with the gateway you're approved on — through a plugin on WooCommerce or through the gateway's API on a custom build. Tested in the gateway's sandbox, then switched to live mode deliberately, with the live and test credentials kept apart.
Send a customer a link to pay a specific amount for a specific order. The link is signed, so it can't be edited. It expires after 30 days, and it refuses to charge if it has expired, if the order changed after it was sent, or if the order is already paid.
The processor tells your systems a payment succeeded, failed, or was refunded. We verify the signature on every event and use it to create the CRM deal, move the stage, and release the order — so nothing depends on a browser redirect completing.
Payments matched to invoices in QuickBooks Online and to deals in your CRM, with deal stages that move with the money. Only real, settled payments count — not attempts, not pending holds.
A webhook can be missed. So we add a sweep that rechecks recent payments on a schedule and a daily recheck after that, so a dropped event is caught within minutes instead of at month-end.
From cart to paid, recorded everywhere.
- BrowserCart sends product codes only
- ServerPrices recomputed; stale cart refused
- StripeCard, Apple Pay, or Google Pay charged
- WebhookSigned event verified
- CRMDeal written; stage moves with payment
- QuickBooksPayment matched; sweep catches misses
The browser never decides what something costs, and nothing downstream moves until the processor itself confirms the money.
Three payment systems, three different problems.
Stripe Checkout priced on the server: the browser sends product codes only, and stale carts are refused. Apple Pay and Google Pay are on, and required acknowledgements are recorded. A Stripe webhook writes the HubSpot contact, deal, and line items. At the counter, staff take payment on the device or send a signed pay link good for 30 days. Behind it, a pricing engine turns a 1,593-row supplier catalog into 878 computed prices, and 12 automated test suites guard the flow. Details on our HubSpot integration page.
Invoices are built in QuickBooks Online to the cent from the CRM order. A separate integration service on Next.js and Vercel receives Intuit-signed webhooks, sweeps every 15 minutes, and rechecks daily. Only real settled payments count. Deal stages move with the money — Order Request, Invoiced–Awaiting Payment, Partially Paid, Paid — and paid status reaches the CRM within 15 minutes, usually under one. Paid orders flow on to ShipStation. See QuickBooks integration.
During a rescue of a store running 58 plugins and 94 code snippets, we debugged the live card gateway on its WooCommerce checkout — and found a staging gateway configured in live mode. The same rescue found a cache leak serving unlocked prices to every guest, a cart that emptied when shoppers pressed Back, and none of three cart-recovery systems working. Checkout got 23% faster. See website rescue.
Where payment integrations quietly lose money.
A staging gateway left in live mode, or live keys on a staging site. Either one means real charges in the wrong place or test charges you think are real. We separate them and check which mode every environment is in.
A checkout that charges whatever number the page sends. We recompute every price on the server and refuse carts that don't match.
Caching that serves one customer's pricing to everyone. We found exactly this on a WooCommerce store — unlocked prices served to every guest — and fixed the cache rules.
A webhook missed during an outage, and nobody notices until reconciliation. We add scheduled sweeps so a missed event is caught automatically.
One audit found 16 of 21 invoices edited after sending and $2,697.15 of sales tax wrongly charged to 15 out-of-state buyers. We build invoicing that refuses to send a mismatch and opens a task instead. A systems audit finds these.
Questions people ask about payment integration.
Can you get me approved for a high-risk merchant account?
No, and nobody honest can promise that. The merchant account is a relationship between you and the processor, who underwrites your business and decides on approval and terms. What we do is integrate whatever processor or gateway you are approved on, and build the website so it presents your business clearly to an underwriter. The account, and the underwriting relationship, stay yours.
How much does payment gateway integration cost?
Payment integration is scoped per project. A standard Stripe Checkout on a site we are already building is a modest addition. A custom checkout with server-side pricing, signed pay links, webhooks into a CRM, and payment sync into QuickBooks Online is a larger build. We review your processor, your platform, and where payments need to end up, then give you a fixed scope and price.
Does a Stripe integration put me in PCI scope?
Every business that takes cards has some PCI responsibility, but the integration decides how much. When card details are entered on the processor's hosted checkout or hosted fields, they never touch your server, which keeps your scope small. You still complete the self-assessment your processor asks for each year. We build so card data stays with the processor.
Can payments sync into my CRM and QuickBooks automatically?
Yes. For a B2B wholesale distributor we built payment sync from QuickBooks Online back into Zoho CRM using signed webhooks, a 15-minute sweep, and a daily recheck. Paid status reaches the CRM within 15 minutes, usually under one, and deal stages move from Invoiced to Partially Paid to Paid on their own. Only real settled payments count.
What is a webhook and why does my checkout need one?
A webhook is a message the payment processor sends directly to your systems when something happens, such as a payment succeeding or a refund being issued. It is signed, so your server can verify it is genuine. Relying on the customer's browser returning to a thank-you page is fragile, because people close tabs. Webhooks are how the CRM, the order, and the books learn about a payment reliably.
Can you fix a checkout that is failing on WooCommerce?
Yes. On an established WooCommerce store with 58 plugins we debugged the live card gateway on checkout and found a staging gateway configured in live mode. The same work fixed a cart that emptied when shoppers pressed Back and a cache leak serving unlocked prices to every guest, and made checkout 23 percent faster. Every change shipped with a backup and a one-command rollback.
Payments rarely live alone. See our HubSpot integration and Zoho CRM integration work for where payments land, QuickBooks integration for the books, and WooCommerce development if your store runs on WordPress. The bigger picture is on our systems integration page, and the finished builds are on our work page.
Ready for a checkout you never have to think about?
Tell us which processor you're on, what platform your site runs, and where payments need to end up. We'll tell you what's at risk and what it takes to fix it.
Begin the Conversation