Payment Gateway Integration Services
Payment gateway integration services for card, wallet, and bank payments that settle and reconcile
A payment integration is judged at the checkout, where a declined card or a missing wallet costs the order, and in finance, where the settlement file has to match the orders it paid for. ZingZee provides payment gateway integration services for retailers, marketplaces, and subscription businesses in Cyprus and across Europe, delivered through its five-phase framework with the first method live in weeks.
What payment gateway integration services cover
Payment gateway integration services cover the design, build, and operation of the layer between a shop or a platform and the providers that move its money: card acquirers, device wallets, bank transfer schemes, instalment providers, and the accounts that receive payouts.
ZingZee builds that layer for retailers, marketplaces, and subscription businesses that need card, wallet, and bank payments live in weeks, with strong customer authentication under PSD2, fraud rules, and a reconciliation that matches every settlement to an order. Card data is held by the acquirer, so the client's PCI DSS scope stays as small as the scheme rules allow, and the same payment layer serves the website, the app, and the trade portal.
What ZingZee builds for payments
The checkout side comes first: a payment step that offers cards, device wallets, bank transfer, and instalments from one screen. Each transaction is routed to the acquirer and the flow by card type, country, and amount, and strong customer authentication is applied only where PSD2 requires it. Exemptions for low value, low risk, and trusted beneficiaries are requested where the acquirer supports them, and stored credentials are handled for repeat and subscription orders under the scheme rules.
The money side follows: capture on dispatch or in parts for split shipments, refunds and partial refunds from the order desk, chargeback evidence assembled from the order record, and payouts to sellers, partners, or store owners on a schedule with a statement. Each movement is written to a ledger the finance team reads, and the settlement files from every provider are matched to that ledger each morning, with the differences listed by cause.
Controls sit around both. Fraud rules score an order on velocity, address, device, and history before capture, a review queue holds the cases the rules cannot decide, tokenisation keeps card numbers off the client's servers, and monitoring raises an alert when an acquirer's approval rate falls. Providers sit behind adapters with a documented contract, so a second acquirer can be added for resilience or cost without touching the checkout.
Why retailers choose ZingZee for payments work
Live in weeks on the acquirer the client holds
The build starts on the merchant agreement the client already holds, adds providers behind adapters, and takes the first payment method live in weeks, with the remaining methods added in following releases while orders keep flowing through the existing checkout.
Reconciliation designed with finance
The settlement matching, the ledger postings, and the differences report are designed with the finance team and tested on their real files before launch, so the month-end process is agreed before the checkout changes.
PCI DSS scope kept small
Card data is captured in fields hosted by the acquirer and stored as tokens there, so the client's servers never see a card number. The PCI DSS obligation stays with the shortest questionnaire the scheme allows, and ZingZee supplies the technical evidence.
Provider independence by design
Every acquirer, wallet, bank scheme, and instalment provider sits behind an adapter with a documented contract. A provider can be added for approval rate or cost, or replaced after a fee change, without a change to the checkout or the ledger.
Payment gateway integration services for card, wallet, and bank payments that settle and reconcile
Payment integration use cases
Add wallets and a second acquirer to an existing shop
A retailer adds device wallets and a second acquirer beside its existing one, with routing that sends each card to the provider most likely to approve it and falls back on an outage. Approval rates per provider appear in a daily report beside the fees, so the routing rules are adjusted on evidence.
Pay marketplace sellers from one ledger
A marketplace payout system takes payment from buyers, holds funds until delivery is confirmed, deducts its commission, and pays sellers on a weekly schedule with a statement. Refunds and chargebacks are charged back to the seller's balance, and the finance team reads one ledger for the whole marketplace.
Charge subscription renewals with stored credentials
A subscription business stores card credentials at the acquirer under strong customer authentication and charges renewals as merchant-initiated transactions. Failed renewals are retried on a schedule tuned to the decline reason, and the customer is asked to update the card before the service is paused.
Take deposits and balances on separate dates
A travel or hospitality platform takes a deposit at booking, holds or charges the balance on a later date, and releases or captures a security amount after the stay. Each movement is posted to the ledger, and each hold expiry is tracked against the issuing bank's limit.
Close the month in hours with automated reconciliation
A retailer whose finance team spent days each month matching acquirer, wallet, and instalment settlement files to orders gets a reconciliation that runs every morning. Differences are listed by cause, fees and chargebacks post to the ledger automatically, and the month closes in hours.
When payment gateway integration is the right choice
Payment gateway integration is the right choice when a retailer or platform is losing orders at the payment step and can see it: declines that a second acquirer would have approved, wallets missing on the phone, or an authentication challenge on every purchase. It is the right choice when finance spends days each month matching settlement files to orders by hand, or when a marketplace needs to pay sellers and cannot from a single merchant account. It suits a subscription business whose renewals fail without a retry, and a chain that wants the same acquirer and the same reporting for the till and the website. The strategic assessment confirms which method goes live first.
When a custom payment integration is the wrong choice
A custom payment integration is the wrong choice when a hosted shop platform's built-in checkout covers the payment methods customers use and the volume does not justify a second provider. A single-country shop with card and one wallet, a few hundred orders a month, and a finance team that can match one settlement file is served by the platform's own checkout, and ZingZee says so during the assessment. It is the wrong answer where the client wants to hold card data itself, because the PCI DSS obligation that follows costs more than any acquirer fee it saves. It is also the wrong choice for a firm that needs its own ledger under a payment licence, which ZingZee's banking and fintech work covers.
Payment gateway integration services ZingZee provides
Card acquiring and wallet integration
ZingZee connects the checkout to one or more card acquirers and to device wallets, with routing by card type, country, and amount, tokenised card storage at the acquirer, and a fallback acquirer where the client wants resilience. Approval rates are reported per provider each day.
PSD2 strong customer authentication
ZingZee applies 3-D Secure where PSD2 requires it, requests exemptions for low value, low risk, and trusted beneficiaries where the acquirer supports them, and handles stored credentials for subscriptions and repeat orders as merchant-initiated transactions under the scheme rules.
Bank transfer and instalment payments
SEPA credit transfer and open banking payments are added for high-value orders, with instalment providers whose eligibility is shown before the customer commits. Each method is treated as a payment intent with the same capture, refund, and reconciliation as a card.
Reconciliation and payouts
ZingZee's payment reconciliation software matches settlement files from every provider to orders and refunds each morning, with fees, reserves, and chargebacks posted to a ledger the finance team reads. Payouts to sellers, partners, or stores run on a schedule with a statement per recipient.
Fraud rules and PCI DSS scope reduction
ZingZee builds rules that score orders on velocity, address, device, and history, with a review queue for borderline cases. Card data never touches the client's servers, so the PCI DSS questionnaire stays the shortest the scheme allows.
Payment integration engagement scope
Deliverables
The payment layer in production, source code and infrastructure definitions in the client's repositories, the integration contract for each provider, the reconciliation reports and ledger postings, the fraud rule set with its documentation, the test evidence from each provider's sandbox, and the operations runbook.
Included as standard
A strategic assessment with the e-commerce and finance teams, integration against each provider's sandbox and certification where the scheme requires it, strong customer authentication set-up, a reconciliation tested on real settlement files, monitoring of approval rates, go-live support through the first month end, and an aftercare phase after go-live.
Priced separately
Additional acquirers, wallets, or instalment providers beyond the agreed set, payout schemes for further recipient types, a fraud model trained on the client's own history, ongoing support after the aftercare phase, and any provider ZingZee is asked to add after the assessment.
What the client provides
Merchant agreements and sandbox credentials for each provider, the current settlement files and the finance team's matching rules, the order data model or access to the shop platform, a policy for refunds and chargebacks, and a sponsor who can approve the fraud rules and each release.
Outside the engagement
Merchant agreements and their fees, the client's relationship with acquirers and card schemes, the PCI DSS attestation itself, and tax and consumer law advice remain with the client, with ZingZee supplying the technical evidence each needs.
How a payment integration engagement with ZingZee runs
A payment integration engagement with ZingZee runs through the five-phase delivery framework. The strategic assessment reads the decline and abandonment data from the current checkout, interviews the e-commerce and finance teams, collects the settlement files and the matching rules, and lists the providers in the order of delivery. The AI roadmap fixes the payment flow per method and country, the ledger model, the reconciliation specification, and the fraud rule set. Integration and deployment builds in reviewed increments per provider, certifies each integration in the provider's sandbox, tests the reconciliation on the finance team's real files, and puts one method live behind a feature flag before adding the next. Adoption and enablement trains the order desk on refunds and chargebacks and the finance team on the reconciliation screen. Governance, optimisation and scale reviews approval rates, fees, and scheme mandate changes with the client at an agreed cadence.
Strategic assessment
We assess how the business operates today: its processes, its data and the systems it runs on. From that we identify the use cases with the highest return and confirm the organisation is ready to adopt them, so the programme starts from a defined baseline.
AI roadmap
Findings become a phased roadmap that balances early wins with the longer build. ZingZee sets the milestones, the resourcing and the governance that keep delivery on schedule and aligned to business objectives.
Integration and deployment
Our engineers develop, validate and deploy the solution into your production environment, integrated with the enterprise systems you already run and sized for the workloads it will carry.
Adoption and enablement
Enablement programmes prepare business users and technical teams to work with the new capability, and structured change management ensures the organisation captures the full value of what has been deployed.
Governance, optimisation and scale
Ongoing governance, monitoring and optimisation keep the solution accurate, compliant and performing. Proven solutions are then scaled across departments and regions under the same data governance standards.
Payment integration tooling
ZingZee builds payment layers on a stack chosen for correctness under reconciliation, provider independence, and long support. The tooling covers:
- Node or PHP services for payment orchestration, capture, and refunds
- PostgreSQL with append-only ledger tables for every payment, fee, refund, and payout
- Acquirer, wallet, open banking, and instalment provider APIs behind an adapter layer
- 3-D Secure and tokenisation through the provider's hosted fields
- A reconciliation engine that matches settlement files to the ledger and lists differences by cause
- Queues with idempotent retries for webhooks and provider callbacks
- Automated tests against provider sandboxes and reviewed pull requests
Payment engineering practices
Every payment, capture, refund, fee, and payout is a posting in an append-only ledger, so a balance is always the sum of its history and a correction is a new posting that references the one it reverses. Provider webhooks are verified and processed idempotently, so a repeated callback never captures twice or refunds twice. Card data is entered in fields hosted by the provider and stored as a token there, and secrets live in a managed vault, never in code, logs, or test databases. Approval rates, latency, and settlement differences are monitored per provider with alerts, and every release carries a change record with the tests and the rollback plan.
Cost and time for payment gateway integration
The cost of payment gateway integration depends on the number of providers and payment methods, the countries and currencies in scope, the payout model, the fraud rules required, and the state of the settlement files finance works with today. A single acquirer with wallets and strong customer authentication on an existing shop is a matter of weeks from assessment to the first live payment. A marketplace with payouts, a second acquirer, instalments, and a full reconciliation is a matter of months and is delivered method by method, with each one live and measured before the next. ZingZee provides a written estimate after the strategic assessment and phases the budget per payment method.
Businesses ZingZee builds payment integrations for
ZingZee's payment integration development serves online retailers adding wallets, instalments, or a second acquirer, for chains that want one acquirer and one report across the till and the website, and for marketplaces that hold funds and pay sellers.
It builds for subscription businesses in food, media, and software that depend on stored credentials and renewals, and for travel and hospitality platforms that take deposits and balances on separate dates. Distributors and service businesses in Cyprus that need bank transfer and card on the same invoice use the same layer, and the same e-commerce payment integration serves a single shop in Cyprus and a platform with thousands of recipients.
What happens next?
You send the payment methods you offer today, the providers you hold agreements with, the decline or reconciliation problem you most want solved, and the shop or platform the integration must fit.
An engineer reads it and replies within two working days with the shape of a strategic assessment.
You sign a non-disclosure agreement if you need one, and you receive a proposal with the providers, the order of delivery, the team, and the date the first method goes live.
Frequently asked questions
Straight answers on Payments work with ZingZee.