• Integrations · OpenCart 3.x

Online payment in the store: how many methods are really needed

Connecting online payment in an online store does not start with choosing a gateway, but with the question of what exactly your customers are paying for. On July 31, 2026, we took data from 24 live stores: a professional tool store has ten payment methods at the checkout, and a lingerie retail store with 115,456 items has exactly two, both postpaid. Both stores are alive and selling. The difference is not that someone did better, but that the assortment and the buyer are different.

See how it works
Price
after a free audit
Guarantee
30 days after project sign-off
Connection term
8–14 working days, of which 1-2 are checkout verification
Price
after a free audit
Guarantee
30
days after project sign-off
Connection term
8–14
working days, of which 1-2 are checkout verification
Cost
after a free checkout check
The maximum in our measurements
10
payment methods in one store
A minimum that also works
2
ways, both postpaid
What is required of you
agreement with the payment provider and details
Free audit

Instead of a price fork — a free checkout check

Before naming the amount, we go through your checkout as a buyer: what payment methods are actually available, do they match the terms page, where the form loses the person.

What we measure

  1. Real calculation methodswe go through the checkout at each delivery method - at one of the measured stores in the footer there were LiqPay and Visa, and at the checkout itself there were only two post-payment options
  2. Number of steps to paymenthow many fields and clicks separate the cart from order confirmation
  3. Non-cash settlementcan a legal entity receive an invoice and documents without calling the manager
  4. Payment in installmentsdoes it make sense with your average check
  5. Payment terms pagedoes what is written on it match what the buyer sees at checkout

What you get

  • a list of calculation methods that actually work
  • discrepancies between the terms page and the actual checkout
  • recommendation, which methods to put to you, and which will be idle
  • evaluation of works with a breakdown by stages

Timeline: 1-2 working days

Why is it free

We do not name the amount without seeing the checkout: connecting one gateway and rebuilding calculations with documents are works that differ in many ways.

What's next

You receive a written assessment. You can decide whether to work with us or not after it — the inspection does not obligate you to anything.

Short form: your contact and site URL
Contract and paperwork

We work officially

Contract, act and invoice — for every project, not just large ones.

Trusted by6 brands

Trusted by: Kvant Energy, GYPSUN, Naturel Cosmetics, Pancer Protection, LUGI, BeeTech

Terms fixed in writing8 points

  • Contract, act and 30-day warranty

    Every project gets a written contract: scope, deadlines, amount, acceptance procedure. After delivery — act and invoice, then 30 calendar days of warranty.

  • Sole proprietor & bank transfer

    The contractor is a registered sole proprietor. Payment by invoice with closing documents.

  • Rights & access — yours

    Code, design and materials transfer to you after full payment. Domain, hosting, repository and analytics are registered to you.

  • Client portal instead of email chains

    During the project you get access to a portal: contracts, invoices, acts and project status in one place.

  • Sites in nine countries

    Our sites run in nine countries: besides Ukraine — Poland, Germany, Austria, England, Norway, Bulgaria, Moldova and Spain.

  • Verifiable numbers

    Every case in the portfolio comes with a link to a live site and a technical measurement.

  • Audit first, then pricing

    There is no price list on the site intentionally: the scope of the same work differs multiples between clients.

  • We say "no" when unsure

    If the task isn't ours or the deadline is unrealistic — we tell you upfront.

  • Contract, act and 30-day warranty

    Every project gets a written contract: scope, deadlines, amount, acceptance procedure. After delivery — act and invoice, then 30 calendar days of warranty.

  • Sole proprietor & bank transfer

    The contractor is a registered sole proprietor. Payment by invoice with closing documents.

  • Rights & access — yours

    Code, design and materials transfer to you after full payment. Domain, hosting, repository and analytics are registered to you.

  • Client portal instead of email chains

    During the project you get access to a portal: contracts, invoices, acts and project status in one place.

  • Sites in nine countries

    Our sites run in nine countries: besides Ukraine — Poland, Germany, Austria, England, Norway, Bulgaria, Moldova and Spain.

  • Verifiable numbers

    Every case in the portfolio comes with a link to a live site and a technical measurement.

  • Audit first, then pricing

    There is no price list on the site intentionally: the scope of the same work differs multiples between clients.

  • We say "no" when unsure

    If the task isn't ours or the deadline is unrealistic — we tell you upfront.

We sign NDAs on request. After completing the work, we delete our access to your services ourselves.

What affects the price

Why two seemingly identical tasks are priced differently

  • Number of calculation methodsOne lock is installed in a day or two. Ten ways, as in a measured tool shop, are not ten identical jobs, but ten different scenarios in the checkout, each with its own conditions of availability.
  • Non-cash settlement and documentsAccount, VAT, details of a legal entity — a separate branch of the checkout. It is almost always more expensive than a card gateway, because it does not concern payment, but document flow.
  • Payment in installmentsTechnically, this is a separate connection with its own moderation on the bank's side. The deadline here is determined not by work, but by the speed of the bank.
  • Checkout status nowIf the checkout is self-written or rewritten by a previous contractor, connecting the gateway turns into parsing someone else's code. That's the biggest unknown, and that's what a free check removes.
  • Connection of payment with deliveryA payment method may be available with one carrier and disappear with another. Checking each combination adds work, but without it, some buyers end up with an empty list.
  • Platform versionOn OpenCart 4.x, some of the modules do not yet have assemblies, and then the solution is either an analogue or a modification. It comes out on the brief, not in the process.
Who it's for

Situations where this service delivers results

Scenario 1 of 4

A store where payment is still accepted by calling the manager

The buyer leaves an application, the manager calls back and dictates the details. It works as long as there are few orders, and it breaks down exactly when there are more: the manager becomes a bottleneck, and some customers do not wait for the call.

We'll review your situation in a free audit
What's included

Complete list of work and what you get as a result

  • Connected payment gateway with battle keys - not test keys: Test keys in the sale give orders that look like they are paid, but there is no money behind them.
  • Payment methods with human names in the checkout - the buyer should understand the difference between them without explanation.
  • Cashless settlement with VAT and without VAT, if legal entities buy from you: the account is formed without the involvement of the manager.
  • Pay in installments where appropriate on your check — and the reasons why right there.
  • Callback processing from the payment system: the status of the order changes upon the fact of payment, and not upon pressing a button.
  • Protection against double payment and against changing the amount on the client's side.
  • A payment terms page that matches what the buyer sees at checkout.
  • Validation on all shipping methods: A payment method may be available with one carrier and disappear with another.
When this service isn't right

What's not included — so there are no surprises at delivery

  • Opening an account and signing an agreement with a payment provider is done by the business owner personally, the contractor cannot do it for him.
  • Fiscalization of checks: this is a separate requirement of the law and a separate job.
  • Accounting of payments and reconciliation of statements.
  • Refund as a business process — we will make it technically possible, the regulations are up to you.
Process steps

Transparent stages with approval at every step

Total duration:3–12 days

  1. Checkout Checkout

    1-2 days

    We go through your checkout as a buyer for each delivery method, compare it with the payment terms page, and fix any discrepancies.

  2. Choice of calculation methods

    1 day

    Based on your assortment, the average check and the share of legal entities, we decide what to bet. Here we sift out what will be idle.

  3. Gateway connection

    2–5 days

    Combat keys, callback processing, change of order status upon payment, protection against double debiting.

  4. Non-cash settlement

    2–4 days

    If companies buy from you: a separate branch with details, invoice and documents.

  5. Test payments

    1 day

    We go through real payments in small amounts on each method and each carrier, check returns.

  6. Texts and terms page

    1 day

    The method names in the checkout and checkout page boil down to what actually works.

Did not find your case?

Describe how it works on your side — we will tell you whether “Connection of online payment in the online store” fits and what it means in your situation. No brief and no call: one question, one answer.

Cases

Tasks and results in numbers — all metrics measured by us

Stanleys Ukraine

online store of professional tools, catalog of over 6,000 SKUs

Task
Serve both the retail customer and the company in one checkout, without forcing either of them to call the manager.
Solution
Checkout with ten payment methods — including installments from two banks — and four delivery methods, including Rozetka Delivery. Each payment and carrier combination is verified separately.
Result
Measured on 07/31/2026: 10 payment methods and 4 delivery methods at checkout, 6,486 product pages and 361 categories, first server response 0.67s at 408KB HTML.

2PM

online retail underwear store with a catalog of over 110,000 items

Task
Check whether the payment methods declared on the website really work.
Solution
Checked out as a buyer on all four shipping methods and compared the result with the payment terms page and the icons in the footer.
Result
In the real checkout, there were exactly two methods, both postpaid: there is no online payment, despite the LiqPay, Visa and privat24 icons in the footer. At the same time, the catalog of 115,456 items is the largest in our measurements. Measured on 07/31/2026.
Technologies & integrations

What we build on and what it connects to

Stack

  • OpenCart 3.x
  • OpenCart 4.x
  • WooCommerce
  • PHP
  • MySQL

Integrations

  • LiqPay
  • WayForPay
  • monobank
  • Fondy
  • PrivatBank
  • Visa/Mastercard
Connect it yourself or give it to us

How this option differs from the alternative

Ready-made module on your ownOur approach
Termhalf a day to install the module — and an indefinite amount of time to find out why the statuses do not change8–14 business days with test payments
Callback payment systemtypical mistake: the order is considered paid after the buyer returns to the siteis being processed, the status changes upon payment
Cashless with documentsit is usually absent in ready-made modulesa separate checkout branch without the involvement of a manager
Checking combinationsone scenario is tested, the rest are found to be customer complaintsevery payment method on every carrier
What we need from you

We can't start without this — best to prepare in advance

  1. a contract with a payment provider or willingness to sign it
  2. details for non-cash payment
  3. approximate share of legal entities among your buyers
  4. the average check and the most expensive item in the catalog
  5. access to admin and hosting
If something is missing — let us know, we'll help you gather it or do it as a separate task.
FAQ

Most frequently asked questions — with concrete answers

How many payment methods to put?

As much as they will actually use. There are ten of them in the measured instrument store, and each has its own scenario: installment for an expensive position, cashless for a company, postpaid for a cautious buyer. There are two workers in the underwear store for 115,456 items, both postpaid, and the store sells. Putting ten ways "to be" is harmful: a long list at the payment step slows down the decision.

Is online payment mandatory at all?

No, and we have a measured counterexample where it is not consciously present. The wholesale underwear store with 13,428 items explains directly on the website: there is no online payment, so that the buyer does not pay for a product that may not be available. For wholesalers with moving balances, this is more rational than returning money.

Which gateway to choose?

It's not about the gateway, it's about what you're selling. Among the measured stores there are LiqPay, WayForPay, monobank, Fondy and payment by PrivatBank details — and none of them is "correct" in itself. The difference is in fees, connection speed, and whether the provider supports the scenarios you need, such as paying in installments.

What is a callback and why is it constantly mentioned?

This is a message from the payment system to your site that the money has arrived. A typical mistake of ready-made modules is to consider the order as paid when the buyer returns to the site after payment. These two events are not the same: the buyer can close the tab before returning, or they can return without paying.

How long does it take to connect?

The technical part — from three days. The real term is more often determined not by the work, but by the provider: the contract, verification and moderation on the bank's side go at their own pace, and payment in installments takes the longest here. That's why we start work in parallel with your drawing up of the contract.

Legal entities buy from us. What about invoices and VAT?

This is a separate checkout branch: the buyer chooses a non-cash payment, enters details and receives an invoice without calling the manager. In measured stores of garden equipment, cashless with VAT stands next to a regular card - equipment is expensive, and companies buy it on an equal footing with private buyers.

Why are payment system icons in the footer a risk?

Because they promise something that may not be in the checkout. LiqPay, Visa and privat24 were on the measured underwear store in the footer, and only cash on delivery in the real checkout. The buyer arrives at the payment with expectation and does not find it; it's worse than honestly showing nothing.

Is it possible to connect payment in installments?

Technically yes, but first you should calculate whether it makes sense. On expensive equipment, it removes the decision barrier — in a measured store of garden equipment, the purchase in parts for three payments is among the eight methods of calculation. On cheap consumables, it simply lengthens the list and adds nothing.

What to do if the checkout was rewritten by the previous contractor?

Then connecting the gateway turns into parsing someone else's code, and it is impossible to honestly evaluate it blindly. That's why we start with a free check: after it, you can see what is installed by the module, and what will have to be done by hand.

Give the website address - let's start with checking the checkout, not with the estimate

In 1-2 working days, we will return with which calculation methods actually work for you, which of them differ from the terms page and what should be included with your assortment. Then there is an assessment of the works broken down by stages.

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  • No commitment
  • We work under a contract

There is no price list on the site on purpose: the same work differs several times over between two clients, and a “from” figure explains nothing in that case. First a free audit — we count your pages, duplicates and speed — then we name the sum and the deadline and fix both in the contract.