For fintech development teams
topropay is the payments-infrastructure layer fintech dev teams integrate against — one unified API across card, ACH, SEPA, wallet, BNPL and crypto, a PCI DSS Level 1 vault, smart routing across connected acquirers, and one reconciliation feed. The dev team ships the product; topropay handles the rails.
Key benefits
Four properties that matter the moment a dev team realises payments is a project with no end — and they'd rather not own that project forever.
A fintech development team usually spends months wiring each acquirer, scheme and APM separately. topropay's connected panel is one integration in front of that whole landscape — new providers come online without re-coding the merchant's checkout.
Hosted page or hosted-fields integrations drop PCI scope to SAQ A / SAQ A-EP. The vault, tokenisation and switch are PCI DSS Level 1 on the platform side — the dev team's app code never touches PAN data.
Settlement files, fees, refunds and chargebacks across every connected provider normalise into one ledger with a stable schema. Finance gets a consistent feed; the dev team doesn't write a parser per rail.
Sandbox covers the full method surface from day one. Production keys swap in cleanly. Partner-data feeds (chargeback CSVs, scheme programme positions) flow through the same APIs as live traffic.
How a fintech product development engagement runs
What an integration timeline actually looks like — sandbox provisioning, integration shape selection, endpoint wiring, webhook subscription, and production cutover.
The fintech development team signs up, runs through KYB for the parent organisation, and gets sandbox credentials inside a few business days. Sandbox is the full method surface — card, ACH, SEPA, wallet, BNPL, crypto.
Hosted page, hosted fields or low-level SDK. The choice is driven by the dev team's PCI scope appetite and how much UI control they want over the buyer surface — all three share the same back-end.
POST /v1/authorizations is the entry point for card, bank rail, wallet, BNPL and crypto. Scheme detection runs against the BIN; routing across connected providers happens server-side; vault tokens come back in the response.
Signed, replay-safe webhook events on capture, settlement, dispute, refund and chargeback. The dev team's back-end stays in sync with the platform without polling. Signature verification is one HMAC check per request.
Production keys land after final underwriting. Settlement files normalise into the same ledger schema as sandbox; the dev team's accounting integration works unchanged. Tier-up to additional providers happens via routing-policy edits.
Main use cases
Six buyer shapes — agency-led builds, fintech product teams, PSPs, neobanks, marketplaces and in-house dev teams migrating off a single provider.
Fintech development outsourcing teams building a payments stack for a client — topropay is the back-end the agency wires the client's checkout against, with the option for the client to keep the platform contract afterwards.
Vertical fintech product builds — SaaS billing, marketplaces, B2B invoicing, embedded payments — that need a payments backbone covering many rails without each rail being a separate project.
PSPs building white-label payments for downstream merchants inherit the connected panel and configure routing policies per merchant. The platform handles the per-provider message exchange; the PSP keeps the merchant relationship.
Licensed financial-services platforms wiring acceptance into their own product surface — payouts on Visa Direct, card acceptance for service fees, and on-platform recurring billing.
Marketplaces routing payouts per seller across card, bank rail and stablecoin under one merchant record; payments-as-a-feature platforms exposing acceptance to their own downstream users.
Dev teams replacing a single payment gateway provider with a multi-provider panel — parallel-running in sandbox first, then a phased traffic cutover via routing-policy edits.
Platform features
Twelve capabilities grouped into API surface, platform primitives, and operations / integration — what the dev team gets for free by building on top instead of from scratch.
One POST /v1/authorizations for card, bank rail, wallet, BNPL and crypto.
Drop-in redirect or iframe checkout — PCI scope SAQ A; brandable via dashboard CSS overrides.
Inline iframes for PAN / expiry / CVV; PCI scope SAQ A-EP; full UI control on the merchant origin.
Server SDKs (Node, Python, Go, PHP, .NET) plus client primitives for bespoke checkouts.
Card data captures into the vault before any provider sees it; PAN never lands in merchant systems.
Scheme network tokens by default; account updaters keep saved credentials alive across re-issuance.
Per-transaction scoring on BIN, scheme, currency, country pair and risk; ranked routes across the connected panel.
Soft declines cascade to the next ranked provider inside the same authorisation; nothing leaks back to the buyer.
HMAC-signed, replay-safe events on every state transition; deterministic IDs for idempotent handlers.
ERP / accounting-system connectors for QuickBooks, Xero, NetSuite, Sage and others.
Stable schema across every connected provider — daily CSV or API export.
One queue across providers; evidence-pack templates per vertical; automated representment for select scheme types.
Industry relevance
Mainstream fintech verticals fit cleanly — SaaS billing, B2B platforms, marketplaces and embedded payments, neobanks and licensed financial-services platforms, expense and treasury tools, and licensed gaming where operating licences exist.
Trust & compliance
One audited platform; merchants and their dev teams inherit the relevant posture instead of carrying separate certifications themselves.
Ready to ship the rails
A 30-minute technical review covers the API surface, the methods relevant to the build, the integration shape that matches your PCI scope and UI control, and a sandbox you can start coding against the same day.
Frequently asked
Scope, SDK languages, versioning, rate limits, outsourcing fit and the practicalities of running a fintech build on top of a unified payments backbone.
topropay is the payments-infrastructure layer that a fintech development company builds against — not itself a fintech development agency. The dev team (in-house, outsourced or a fintech product development company under contract) owns the buyer-facing UI, the merchant's product features and the business logic; topropay owns the unified API, the PCI vault, the routing engine, the dispute queue and the reconciliation feed.
Fintech development on top of the platform usually starts with a sandbox integration of the unified authorise endpoint, then layers on webhook subscriptions, the merchant dashboard, and any accounting / ERP connectors the merchant needs. The full method matrix (card, ACH, SEPA, wallet, BNPL, crypto) is available from the same API; the dev team doesn't add a per-rail integration as features expand.
Platform-side fintech development services on topropay are limited to the payments-infrastructure surface — onboarding, API support, sandbox provisioning, integration consulting on the platform side, and dashboard configuration. Building the merchant's customer-facing product is the dev team's responsibility; topropay is the back-end behind it.
Fintech product development teams get a stable REST contract, server SDKs in popular languages, signed webhooks for state changes, a sandbox covering the full method surface, and engineering support during integration. A typical fintech product launch from contract to first production transaction is 2–6 weeks depending on integration shape, vertical and KYB depth.
Fintech development outsourcing works well with topropay because the integration boundary is well-defined: the outsourced team writes against a stable API surface and the merchant keeps the platform contract directly. If the outsourcing engagement ends, the integration stays — the platform relationship doesn't change with the dev partner.
A fintech product development company can integrate topropay into a product they ship to their own clients, with the end-merchant either holding the platform contract directly or sub-merchanting under the dev company's parent contract. Both shapes are supported; the right choice depends on volume, vertical and the dev company's risk appetite.
Custom fintech development with non-standard payment flows — for example marketplace per-seller routing, split capture, delayed-fulfilment auth-capture, or per-vertical fraud rules — is supported through configuration of the same platform primitives rather than per-customer code branches. The platform doesn't ship custom forks; instead the routing engine and the dashboard are expressive enough to model most non-standard flows.
Yes. During integration the dev team has access to a Slack or shared channel with the platform's solutions engineers, plus sandbox parity with production and a reference implementation. Post-launch support continues through ticketed and ad-hoc channels.
Server SDKs ship for Node.js, Python, Go, PHP and .NET. The REST API is also fully documented for direct integration in any language with HTTPS support. Client SDKs cover Web (vanilla JS + React / Vue helpers), iOS (Swift) and Android (Kotlin).
API versions are pinned per integration; existing integrations don't break when new API versions ship. Migration paths between versions are documented and the platform keeps prior versions live for a defined deprecation window before retirement.
Rate limits are generous on the read side and authorisation-side; bulk operations (export, large list pulls) are throttled per merchant to protect the platform. Specific limits are surfaced in the dashboard and in API response headers per call.
Yes. Sandbox supports load testing on dedicated lanes; spinning up a load-test profile is a dashboard step. Production traffic shaping (peak-hour scaling) is handled platform-side.
Outsourced fintech build onboarding typically pairs the dev partner's engineering lead with topropay's solutions team during a 30-60 minute kickoff: sandbox provisioning, integration-shape selection, webhook subscription scope, KYB scope for the end-merchant, and a milestone plan toward production cutover.
The platform is opinionated only on regulatory posture: licensed gaming, regulated financial services and other compliance-bound verticals are supported where operating licences exist; grey and black-market verticals (unlicensed gambling, adult content) are out of scope regardless of how the dev team frames the product. Mainstream fintech verticals — SaaS, B2B, marketplaces, embedded payments, neobanking, expense management — fit cleanly.
Connected provider outages route around automatically — the routing engine drops the failing provider's score based on real-time error rate, and authorisations land on the next ranked lane inside the same auth. The dev team doesn't write fallback code per provider; the cascade is platform-side.
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