--- title: "Seller Onboarding & KYC for Marketplaces | Fynex" description: "Onboard and verify sellers with KYC and KYB built into your own signup flow — no third-party redirect, no silent rejections. Compliant marketplace seller onboarding that keeps conversion and cuts fraud." url: "/uk/marketplaces/seller-onboarding" --- # Onboard sellers *without dropping them* Run KYC and KYB inside your own signup, so sellers verify without leaving your product. Stay compliant, cut the fraud that lands on your platform, and keep the conversion that bolted-on verification kills. *Marketplace building blocks.* ## KYC that bounces sellers out of your flow costs you sign-ups Stripe Connect's onboarding drops sellers in the middle of signup — opaque rejections, a redirect to someone else's UI, business-detail steps that individuals can't answer. Meanwhile the fraud that slips through lands on your platform as failed cards and chargebacks. Verification you don't control is verification that costs you. ## How seller onboarding runs on Fynex Verify inside your product, approve in the background, keep control. 1. **KYC and KYB inside your own flow** — Sellers verify in your product, not bounced to a third-party page. You collect what you need; approvals happen in the background without breaking the signup. 2. **Cut fraud before it reaches payouts** — Real identity and business checks at onboarding stop the failed-card bombardment and fake sellers that otherwise land on your platform as chargebacks. 3. **Stay compliant as you scale markets** — KYB and KYC are the switch that turns each seller on — handled on our licence, so compliance keeps pace as you add sellers and countries. ## The same job, with the leaks closed Point tools solve part of it. Fynex runs the whole thing on one platform. | The problem | Other platforms (Stripe Connect Express) | Fynex | |---|---|---| | Verify without losing the seller | Redirect to a third-party UI with silent declines. | Embedded KYC/KYB inside your own signup. | | Onboard individuals, not just companies | Business-detail steps individuals can't complete. | Flows that fit sole traders and companies alike. | | Keep fraud off your books | Weak checks; failed cards and chargebacks land on you. | Real KYC/KYB stops bad actors at the door. | | Scale to new markets | Re-solve compliance per country yourself. | Verification handled on our FCA-authorised licence. | ## Questions, answered ### What is the difference between KYC and KYB? KYC (Know Your Customer) verifies an individual's identity; KYB (Know Your Business) confirms a company is legitimate and identifies who controls it. A marketplace onboarding sellers usually needs both — KYC on the person, KYB on the business. Fynex runs both, embedded inside your own signup flow. ### How does Fynex onboard sellers without hurting conversion? KYC and KYB run inside your product instead of bouncing sellers to a third-party page. You collect what you need in your own flow, approvals happen in the background, and sellers verify without the drop-off that a redirect and opaque rejections cause on Stripe Connect Express. ### Does verifying sellers reduce marketplace fraud? Yes. Real identity and business checks at onboarding are what stop fake sellers and the failed-card bombardment that otherwise reaches your platform as chargebacks and negative balances. Because Fynex is the one holding funds and running KYB, that risk is handled at the door rather than after the money moves. ### Can Fynex onboard both individuals and registered businesses? Yes. The flow fits sole traders and individual sellers as well as registered companies, so you're not forcing business-detail steps on a person who doesn't have them — a common failure point with off-the-shelf Connect onboarding. ## The rest of the marketplace money layer Every building block below runs on the same platform. Start with one, or run the whole stack. - **Split payments** — Divide one payment across sellers, your fee and partners — by rule, in real time. - **Escrow & held funds** — Hold a buyer's payment until the work is delivered, then release it to the seller. - **Delayed capture** — Authorize a card at checkout and capture the payment later, when you're ready. - **Platform commission** — Take your cut automatically at settlement — set your take rate once and keep it. - **Payout scheduling** — Pay sellers on schedule or by rule — mass, instant or timed, in any currency and rail. - **Marketplace wallets** — Give each seller a stored balance to hold, top up and withdraw — per currency, one ledger. - **Balance management** — One ledger for every balance, split, hold and payout — reconciled to the transaction. ## Find what you're leaking, for free Send us your setup. We run a free diagnostic and show you what your payment stack costs you today. > One recent diagnostic found €2M in hidden fees across 10 processors for a proptech client. ## The trust layer most software can't offer We can be your Merchant of Record and hold the funds. Most tools can't, because they don't hold the licence. - **FCA-authorised EMI** — An e-money institution via Fondy. We can hold and move your funds. - **PCI DSS Level 1** — The highest card-data security standard, on by default. - **Audit logs** — Every movement traceable and ready for review. - **Built-in KYC / KYB** — The switch that turns the business on. ## Verify every seller. *Without losing a single one* --- The AI finance layer for platforms and operators. It runs the money chain and keeps more of it in your business. One platform instead of a dozen. © 2026 Fynex