Payment Gateway Integration
Card payments that fail safely
Payment gateway integration done well means a customer who is declined sees a plain reason, and a payment that succeeds is recorded everywhere it needs to be. I build those paths myself and test each failure before launch.
★★★★★ 5-star rated on Google · 14 years · 300+ Las Vegas businesses
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Payment Gateway Integration Services
What a payment build covers
A payment build connects your website or app to a payment processor, so a customer can pay by card, and the payment lands in the right record. The build covers the checkout screens, the link to the processor, the record that a payment succeeded or failed, and the messages that follow each result.
Most of the work is in the parts a customer rarely sees: retries, refunds, disputes and the record that ties a payment to an order or an appointment. Each of those parts is written into the scope with a named test. Each part is named in the scope, so the person reading it knows who answers for it.
A gateway integration is judged by what happens when a payment fails, not only when it succeeds. The build records each decline with its reason code, tells the customer what to do next and leaves the order in a state the owner can read.
What a Payment Gateway Does
The card path, step by step
A payment gateway takes the card details, sends them to the processor for approval and returns a result. The processor either approves the payment, declines it or asks the customer for a further check. The gateway passes that result back to your site or app, which then decides what the customer sees next.
The result comes back as a message, and that message is the point where most integrations fail. If the message is lost, a paid order can look unpaid, or an unpaid order can look paid. The integration is built to handle both cases on purpose. A plain log of each result makes it easy to see where a payment stopped.
The gateway holds the card details, talks to the bank network and returns an approval or a decline. The app should never store raw card numbers itself, so the integration hands the card to the gateway and keeps only the token it returns.
Stripe Integration
Stripe as the processor I have built with
Stripe is the processor I have built payments with most directly. I connected it to a Las Vegas business directory, where Stripe payment state decides who is listed, and to the Valhalla client portal, where billing is pulled from Stripe and tied to each client.
Those builds show the pattern I use for any processor: the processor is the only authority on who has paid, the app reads that state, and nothing changes access until the processor confirms the payment. The same pattern applies to other processors when a client already uses one. The pattern is written into the scope so that any later developer can follow it.
Stripe builds are set up with separate test and live keys, webhook endpoints for each environment and a signing secret checked on every event. Keys live in the secret store, never in the code repository.
Test Card Matrix
Scenarios every payment build is tested on
| Scenario | Expected result | How it is tested | Who signs it off |
|---|---|---|---|
| Successful payment | The payment is recorded, the receipt is sent and access is granted | A published test card taken through the full checkout | Me, then you, on a shared screen |
| Card declined | The customer sees a plain reason and no record is created | A published decline test card | Me, with the message wording approved by you |
| Insufficient funds | The order stays unpaid and the customer can try another card | A published insufficient-funds test card | Me, with the retry path noted in the list |
| Extra bank check | The customer completes the bank challenge and the payment then succeeds | A published test card that triggers the challenge | Me, with the screen captured for review |
| Refund issued | The record shows the refund and the customer is notified once | A test refund against a test payment | You, because refunds touch money |
| Result message lost | The record is reconciled and a gap is flagged, never silently fixed | A test with the result message blocked and then replayed | Me, with the reconciliation log shown to you |
Payment Failure Handling
What a customer sees when a card fails
A declined card is normal, and the checkout should say so in plain words. The customer sees the reason the bank gave in simple language, a clear next step such as trying another card, and a way to reach a person. The order stays open, so nothing is lost while they try again.
Failures that are not the customer's fault are logged with a reference number. A failed charge that reached the processor but never reached the record shows up in a reconciliation list, so someone checks it on the same day rather than at the end of the month. A declined customer is never sent to a blank page, and the message says what to try next.
Failed charges get a fixed retry plan that respects the bank's rules, and the customer gets one clear message rather than a stream of alerts. Orders that remain unpaid after the final retry are released back to stock or marked for a manual call.
Card Data and Payment Security
Keeping card numbers off the server
The design goal is that card numbers never touch my code or your server. The customer types the card into fields the processor hosts, and the processor returns a token that stands in for the card. Your system stores the token and the result, not the number.
I still review the parts around that design: the login to the payment account, who can issue refunds, the logs and the access list. I do not claim a certification the build has not been assessed for. The scope states who is responsible for each control. The access list for the processor account is reviewed when a person joins or leaves the team.
The payment page is served from the gateway's hosted fields, which keeps card entry off the app's own servers and narrows the compliance scope. The remaining work is access control, logging without card data and a yearly review of who can see the dashboard.
Payment Methods and Processors
A business rarely needs one payment type alone. The four below are the ones I scope most often, and each one changes the checkout, the record and the test list.
Payment methods are chosen by the customers who buy, not by what is popular. Cards, wallets, bank transfers and buy-now-pay-later options each carry different fees and approval rates, and the list is set before the build.
Payment types I connect
Card payments at checkout
A card checkout for a product or service, with the approval, receipt and order record tied together. Each one is listed in the scope with its test.
Subscriptions and renewals
Recurring plans with clear renewal notices, plan changes and a cancel path a customer can find. Each one is listed in the scope with its test.
Invoices and deposits
A payment link for an invoice or a deposit, with the balance tracked against the job or booking. Each one is listed in the scope with its test.
Refunds and credits
Refunds issued from one place, recorded against the original payment and reported to the people who need them. Each one is listed in the scope with its test.
How Much Payment Gateway Integration Costs
What moves the price of a payment build
I quote a fixed price for a written scope, so the number you agree to is the number you pay. The biggest factors are the payment types, the number of checkout paths, the systems the payment must update and how many test scenarios the build needs.
The processor's own fees are paid directly to the processor and are listed separately in the scope. A single number before the scope exists would be a guess, so I write the scope first, then price each line, including the test scenarios. Test scenarios are priced as their own lines, so you can see the cost of each one.
Cost depends on how many payment methods are connected, whether subscriptions are needed and how many systems the payment record must update, such as the accounting tool or the order database. The quote lists each of those, so no part of the build is hidden in a lump sum.
How a Payment Build Runs
Each step ends with a result you can check. Live payments go on only after the test matrix is signed, and the first real charge is watched closely.
Every payment build follows the same order: a sandbox account, a test plan, a staging run with real test cards, then a small live pilot with a refund ready. Each step ends with a signed-off checklist.
Four steps from scope to live payments
- Step 01
Scope the payment paths
I list each payment type, each outcome and the systems the payment updates, then you approve the list in writing.
- Step 02
Build in test mode
I build the checkout and the record against the processor's test mode, with no real money involved until the matrix passes.
- Step 03
Run the test matrix
I run every scenario in the matrix, record each result and fix each failure, then you review the full list before launch.
- Step 04
Go live and watch
I switch to live keys, make a small real payment you approve, and watch the first days of charges, refunds and reconciliation.
Payment Integration Portfolio
Work I built, live where you can check it
Website build · Henderson
GIOSTAR: the clinic website, booking and lead tracking
I built and run giostarwellness.com for a regenerative medicine and wellness clinic in Henderson: every service page, online booking, financing and a blog. A website lead is tracked end to end, from the form to a booked consult to an active patient, with no manual steps. I also built its live brand hub, so every page, post and print piece pulls the same colours, type and rules.
See the live sitePortfolio Examples
More of the work
Website build · Las Vegas
WebVegas: a Las Vegas web design brand and its booking funnel
See the live site
Brand mark · Event venue
Desert Inn Oasis: the refined mark and the plan for the new site
Site in build
Brand identity · Pharma
Mili Pharma: the butterfly mark and the lockups
Site in build
Social content system
Quotible: a testimonial-led social series
Content system
Want me to look at your site first?
A free audit, and a same-day reply from Justin, personally.
Payment Systems I Have Built
Payment-backed builds with the live link
Each build below uses payment state in a real way. The case study shows which part the payment controls and which part it does not.
Each build page in this set lists what the payment flow had to handle, from declines to recurring charges, so the scope of each job is easy to compare.
- Step 01
Las Vegas business directory
A service directory where Stripe payment state decides who is listed, so nobody chases an invoice to keep a listing active.
- Step 02
Valhalla client portal
A client portal where billing is pulled from Stripe and each client sees the money that actually moved.
Choosing a Payment Integration Developer
What to ask before a payment build
Ask who connects the payment and who answers the processor when a charge fails. Ask whether the processor account is in your name and who holds the keys. Ask how each decline is tested and whether the test list will be shown to you before launch.
Ask how a lost result message is handled, since that is where a paid order most often goes missing. A specific answer is written into the scope. A vague one usually means the failure paths will be found by a customer. A developer who cannot name the processor's test mode is not ready to touch live payments.
Ask a candidate to show a failed payment in a test environment, the webhook log for that event and the refund path. A builder who can walk through those three things has handled real payment traffic before.
Payment Integration Questions
Questions merchants ask before a build
Payment Integration Reviews
What clients wrote on Google
- ★★★★★
After going back and forth on whether to bring in outside help, we ended up working with Justin for some AI consulting on how to structure our operations. He laid out a clear plan, didn't overcomplicate it, and we've been running smoother since. Good fit for a service business. He knows Las Vegas and he knows this stuff.
Kristen S. · Google
- ★★★★★
Justin joined our team a few months before opening to replace a marketing agency that wasn’t performing. He stepped up fast. Within weeks he launched a fully redesigned website with new brand guidelines, built and delivered our marketing plan and AI strategy, and helped implement our system architecture so we could open on time. Since then, he’s made several critical enhancements to the site that helped us generate revenue in our first month. His engagement was supposed to end at opening, but he became such an integral part of our leadership team that we kept him on to help evolve our marketing and tech strategy as we grow. He’s easy to work with, pushes back when it matters, and moves easily between strategy, delivery, and operations depending on what’s needed. If you’re looking for a deeply experienced, knowledgeable, and dedicated marketing, AI, or technology consultant, I highly recommend Justin Harris AI Consulting.
Devin R. · Google
- ★★★★★
Justin has been a true Gem to have as part of our company. His professionalism, immediate attention to branding and extensive details in marketing has made so much improvement on our business. We are forever grateful to have such and amazing marketing asset and cannot thank you enough Justin!
Desi W. · Google
- ★★★★
Justin Harris was very helpful in resolving some issues we had with our Webflow website.
Kristy F. · Google
- ★★★★★
I had the pleasure of working alongside Justin and consistently saw firsthand the level of dedication and professionalism he brings to his work. He was always the first one in the office, setting the tone with his strong work ethic and commitment to excellence. What stood out most was how deeply he cared about every client. He approached each project with thoughtfulness, expertise, and a genuine drive to deliver meaningful results. He combines sharp technical knowledge with a practical, solutions-oriented mindset, which makes him especially effective in the AI space. Any organization looking for thoughtful, reliable, and highly skilled AI consulting support would be in great hands working with him!
Jenevine Y. · Google
- ★★★★★
Hired him to manage our AI systems and it's been pretty smooth. He knew what needed to be done and got it handled without a lot of back and forth. Good experience for our service business.
BC G. · Google
- ★★★★★
I follow Justin on social media and read about his work and his contributions to the AI industry. He really knows how to use the technology in creating a system that allows you to make your business work more efficiently and effectively.
Ana J. · Google
- ★★★★★
Justin was the person I would go to for advice about AI automation for my workload. He knew the subject well and didn't overcomplicate it. For anyone in Las Vegas running a service business and wondering if AI systems are worth looking into, talking to him first is a great move!
Yaneliz M. · Google
- ★★★★★
Working with Justin is always a pleasure. He is professional, trustworthy, and consistently delivers outstanding results. As a longtime Las Vegas local, he has an exceptional knowledge of the territory and truly understands the market. I highly recommend his services to anyone who is serious about growing their business!
k C. · Google
- ★★★★★
From what I've seen, Justin knows the AI automation space better than most people I've come across in Las Vegas. He's the kind of person who actually understands the technical side and can explain it without making you feel lost. Good guy, good reputation.
Afaryn F. · Google
- ★★★★★
I've Known Justin for a while now and he really knows his stuff when it comes to AI consulting. If people in Las Vegas were to ask me for recommendations in this space, he's the best guy for the job, hands down.
Mickey S. · Google
- ★★★★★
After going back and forth on whether to bring in outside help, we reached out to Justin for some AI consulting advice on where our service business could actually use automation. He was straightforward about what made sense and what didn't. Ended up being a useful conversation. Las Vegas has no shortage of people claiming to be experts, and he's one of the few who could back it up.
Vincent M. · Google
- ★★★★★
Known Justin for a few years now and the guy actually knows his stuff when it comes to AI automation. Friends in the Las Vegas service business space keep asking me who to call and I always point them his way.
Chris M. · Google
- ★★★★★
Justin is one of those guys who actually knows what he's talking about and doesn't cut any corners. Will definitely be working with him again.
David S. · Google
- ★★★★★
Justin knows what he's doing highly recommend using his service he will treat you right and give you tremendous value !👍
Gregory J. · Google
- ★★★★★
Known Justin for a many years and the guy actually knows what he's talking about when it comes to AI and automation. Not the type to just throw buzzwords around. Based in Las Vegas and well connected in the space. …
cindy D. · Google
- ★★★★★
Known Justin for a few years now. Guy knows the AI space better than most people I've come across, especially here in Las Vegas where there's no shortage of people claiming to be experts. He actually understands how AI automation works at a practical level, not just the theory. The kind of person who gives you a straight answer with kindness and patience
Katelyn H. · Google
- ★★★★★
Knew Justin before he started building AI systems for businesses, and watching what he's put together is genuinely impressive. He built out an AI automation setup for my website in Las Vegas and it changed how we handle leads completely. The guy actually runs this stuff himself, so he knows what works.
Justin E. · Google
Recurring Billing and Subscriptions
Plans that renew without surprises
A subscription is a promise to charge again later, and each renewal is a place where a customer can feel misled. The build shows the plan, the price the customer agreed to and the date of the next charge before the first payment is taken.
Plan changes, upgrades and cancellations are tested as paths of their own. A cancellation that is hard to find is a complaint waiting to happen, so the cancel path is part of the scope and is tested like any other checkout step. Renewal notices go out before the charge, with the amount and the date written in the message.
Subscriptions add plan changes, prorated credits, dunning emails and cancellations to the list of paths that need testing. Each path is written as a test case with the expected outcome, so a plan change does not quietly break invoices.
Refunds and Chargeback Handling
Money going back, handled on purpose
A refund changes the money, the record and the customer's trust at the same time, so each refund is recorded against the original payment with the reason and the person who approved it. Refunds can be issued from one place, and the record updates the same day.
A chargeback, where a customer disputes a charge with the bank, arrives as a notice from the processor. The notice is linked to the original order, the evidence is gathered from the record and the deadline is shown on the list your team works from. Each chargeback has a named owner and a due date, so none is missed while the team is busy.
Refunds are issued through the same integration that took the payment, which keeps the ledger consistent. A chargeback creates a case record with the evidence attached, so the owner can respond inside the bank's deadline.
Payment Gateway Questions for Owners
Questions about money, risk and timing
Payment Gateway Integration Las Vegas NV
Every part of the Valley, by ZIP code
Las Vegas
89030 · 89101 · 89102 · 89104 · 89106 · 89107 · 89108 · 89109 · 89110 · 89117 · 89124 · 89128 · 89129 · 89130 · 89131 · 89134 · 89138 · 89143 · 89144 · 89145 · 89146 · 89149 · 89166
Henderson
89002 · 89005 · 89011 · 89012 · 89014 · 89015 · 89044 · 89052 · 89054 · 89074 · 89120 · 89122 · 89123 · 89183
North Las Vegas
89030 · 89031 · 89032 · 89081 · 89084 · 89085 · 89086 · 89101 · 89115 · 89130
Summerlin
89128 · 89134 · 89135 · 89138 · 89144 · 89145 · 89148 · 89161
Spring Valley
89102 · 89103 · 89113 · 89117 · 89118 · 89146 · 89147 · 89148 · 89178
Paradise
89074 · 89102 · 89103 · 89109 · 89118 · 89119 · 89120 · 89121 · 89123 · 89158 · 89169 · 89183
Enterprise
89113 · 89118 · 89119 · 89123 · 89139 · 89141 · 89148 · 89178 · 89179 · 89183
Sunrise Manor
89104 · 89110 · 89115 · 89121 · 89122 · 89142 · 89156
Boulder City
89005 · 89044
Related Builds
Builds that often sit beside payments
Checkout Design for Card Payments
A checkout a customer can finish
A checkout fails when the customer cannot tell what to do next. Each field is labeled, the total is shown before the card is entered, and the button says what happens when it is pressed. A customer on a phone should be able to finish with one hand, without zooming or retyping an address.
I test the checkout on real phones and on a laptop, with the keyboard open and closed, and with a slow connection. Each step that fails in that test gets a fix and a retest before the checkout goes into the matrix. Error messages are tested as carefully as the happy path, since they are the moment a customer decides whether to stay.
Checkout asks for the fewest fields that still complete the sale. Errors appear next to the field that caused them, and the total, tax and shipping are shown before the card step so the customer is not surprised at the end.
Payment Reconciliation Explained
Matching the processor to the records
Reconciliation is the daily check that the processor and the record agree. Every payment the processor shows should match an order, and every order marked paid should match a payment. When the two lists differ, the difference is shown in a list, with the reference numbers on both sides.
The check runs on its own schedule, so a gap is found the same day it happens. A gap is never fixed silently. The person who owns the order decides the correction, and the decision is recorded beside the entry. The list is short when the build is healthy, and each item on it is a real question someone must answer.
Reconciliation matches each gateway payout to the orders it covers. Differences, such as fees taken before a refund or a partial capture, are listed on a daily report so the books close without a monthly hunt.
Payment Webhooks and Retries
Messages that arrive late or twice
A processor sends a message when a payment succeeds, fails or is refunded. Those messages can arrive late, arrive twice or not arrive at all. A build that trusts the first message and ignores the rest will eventually show a paid order as unpaid, or the reverse.
The integration accepts each message once, checks it against the record, and asks the processor to resend anything that was missed. Each message is logged with its reference number, so a problem can be traced from the processor to the screen a customer saw. The retry rules are written into the scope, with the number of attempts and the wait between them.
Webhooks can arrive twice or out of order, so every handler is written to be safe when repeated. Each event is stored with its ID before processing, and a retry queue catches any event that fails for a temporary reason.
Payment Reports for Owners
Totals that match the bank
A payment report is only useful when its totals match the money that actually moved. Each report shows the gross amount, the refunds, the fees and the net amount for the period, with each figure linked to the payments behind it. The fees come from the processor, not from an estimate.
Reports are scoped as lines in the requirements, so each one answers a named question, such as what was paid this week or which refunds are still open. A report nobody reads is removed at review rather than kept out of habit. Each total can be opened to show the payments behind it, so no figure is taken on trust.
Owners get a weekly report with gross sales, fees, refunds, failed payments and the payout date. The figures use the same definitions as the accounting export, so the numbers match at the end of the month.
Payment Testing Questions
Questions about test cards and launch
Proof, not promises
Case studies I can show you
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A full website audit in Las Vegas: I crawl your whole site, delegate to specialist agents across technical, on-page, speed, schema, local, and AI search, and return one 0-to-100 health score with a ranked fix list.
Read the case studyMonty and the WebVegas Identity: a full logo family plus a clay Gila-monster mascot with a pose library and motion system
How I built a full logo family and Monty, a clay desert Gila-monster mascot with a pose library and motion system, so a local-service brand is remembered, not forgotten.
Read the case studyRelated services
The rest of the range
Talk About Your Payments
Start with the payment paths
Tell me which payment types you take, the systems the payment must update and what should happen when a card is declined, and I will reply with a written scope.