Payment integration and settlement services · 2026

Payments work splits into integration, operations and reconciliation, and risk response. Integration attaches domestic PGs, simple-pay providers, and overseas gateways to your order flow and implements authorization, cancellation, and partial refund so no state is lost. For services running several providers, gathering those integrations into one layer — so product code faces a single transaction contract — belongs here. Routing by card issuer, amount, or region and failover when one provider slows down sit in the same layer. Subscription billing brings plans, invoicing, retry on failed payments, and cancellation into the same lifecycle. Operations and reconciliation bind transaction monitoring, incident response, cancellation and refund, dispute handling, and provider liaison into one team procedure. Alongside it sits reconciliation automation, which matches settlement files from every channel on a shared transaction key and passes only the residual differences to a person. Risk response places a scoring call ahead of the authorization request to catch card testing and coupon abuse. All three can be taken together, or one strand on its own. Teams that already own the integration usually hand over operations alone. WooCommerce storefronts attach the same way, so domestic and overseas payments never need two vendors.

The work runs in four stages. The first is defining the transaction flow: every state through authorization, cancellation, refund, and settlement is written down with the team that owns it, and the result is one state diagram. Reverse that order and attach providers first, and order code grows with every new method until replacing a provider costs more than building it did. The second stage is safe integration. APIs, security, and data flow are built on the assumption that connections drop and responses arrive late. Each request carries a unique key so any number of retries produces one effect, and a transaction with no response is settled against the provider's inquiry contract. Sandbox work starts with failure and cancellation paths rather than the happy path, and provider review is cleared in the same pass. The third stage is operations and reconciliation: monitoring, exception handling, and matching run as one loop, and anomalies are classified to a cause the day they appear. The fourth is settlement stability — reports and detection rules are fixed so that differences can be explained at T+1 without missing the closing cycle.

Defining the transaction flow yields the state diagram and the responsibility matrix: which state moves to which, and who owns that transition, on one page. Safe integration yields the integration specification and the exception design — request and response contracts from checkout call through result notification, retry rules, and the idempotency key policy. Operations and reconciliation yield the matching rules and the operations runbook, which names, per provider, the screen to open first for each symptom, the judgement to make, the owner to escalate to, and how to file with the provider, so the sequence holds when staff change. The rules also record which differences clear automatically and which a person must see. Settlement stability yields the settlement report template and the anomaly rules; every match records which rule joined which two records under what condition, and rule changes are kept alongside, so an audit never recomputes the same figures. All four are documents your team keeps using after the project closes, so they are handed over in editable form rather than locked into our tooling, each with an owner and a revision point named — which makes it obvious what to reopen when a provider is added.

The PG contract is signed by your company. Payment methods and fee terms are compared together, review documents are prepared together, technical questionnaires are answered together, and the build order is fitted to the review calendar — but the name on the contract is yours. Card data is not held directly either. Provider tokens stand in as the default structure, retention scope and access rights are defined during design, and processing records and access logs are kept as evidence. An existing PG contract stays as it is; only the integration structure and operating procedure are rebuilt on top of it. After the build, operations run in-house, shared, or delegated. In-house means your team takes the matching rules, incident runbook, and provider escalation contacts and runs them. Shared means your team takes first intake while diagnosis and provider liaison are split. Delegated means intake through resolution arrives as one procedure. Whichever you pick, the same runbook applies. Access is handed over in steps too — read access to transactions and logs first, refund execution and rule changes only after an approval path exists.