A clean payment can hide a compromised account, a suspicious seller or a coordinated refund pattern. SENTR connects buyer and seller activity, payment history and payout context—so your team can protect the marketplace, not just the checkout.
Buyer–seller events on one policy layer
SENTR.Citadel for depth; SENTR.Tower when the bench is lean
Processor dashboards score the card. Marketplace operators also carry listing quality, coordinated buyer–seller rings,
refund velocity and when sellers get paid. When those controls live in different tools, policy ownership fragments —
and investigators rebuild the story from chat logs and spreadsheets.
Seller onboarding that never sees later payout behaviour on the same entity.
Refund policy that cannot share lists or thresholds with payment scoring.
Payout holds without a readable trail partners and auditors will accept.
Protected marketplace journey
Five events most marketplace programmes eventually need to protect — configured from what you can supply, not assumed marketplace APIs.
If you cannot emit an event or join the identifiers, that step stays out of scope until mapping is ready.
How investigation stays two-sided
Marketplace cases are rarely single-entity. The walkthrough is what operators actually do when refund pressure and payout risk collide.
From refund cluster to reasoned hold
1
Queue surfaces the pair
A refund cluster lands in review with buyer and seller already linked — not two orphan tickets.
2
Connection context opens
Shared devices, reused beneficiaries, and listing velocity sit on one case surface with decision attribution.
3
Override with a reason
Release or hold requires a written rationale that stays on the case for operators and partners.
What this looks like in practice
An ordinary checkout reveals a linked seller pattern
A high-value order clears payment with a familiar card. The same seller account created three near-identical listings in twelve hours, messaged buyers from a reused device cluster, and requested payout acceleration the same day the refund window opened.
Listings ×3 (12h)
Messaging · reused device
Payment clears
Payout acceleration
Response
Allow payment · seller payout → review
Evidence
Listing velocity and device reuse fire; buyer, seller, listings and payout intent stay on one case
The reviewer sees buyer, seller, listings and payout intent on one case — not a payment ticket and a separate trust-and-safety thread.
Product status
Evaluate mapped marketplace events with rules, scoring, explanations and connected investigation. Decision evidence can support your existing dispute process; automated filing is not available. Qualified SENTR.Citadel teams can evaluate read-only in Shadow Mode. SENTR.Tower shares the detection foundation with guided configuration.
Inside the workflow · illustrative configurations
One investigation can follow both sides of the order.
Configure the shared platform around buyer and seller roles in your data. The goal is to connect the evidence—not to assume every shared identifier means collusion.
Illustrative mechanism
See both sides of the order.Read the diagram
Buyer and seller are connected through a listing and a shared payment method in this synthetic example. Inspect those relationships with refund and payout history. Sharing does not establish collusion. Buyer, seller and order relationships depend on the role and identifier mapping agreed during integration.
01Ordinary buyer payments reveal a repeated seller pattern
Connect the context
Map buyer and seller identities, orders, instrument identifiers, available device links and later refunds or payouts. Exact role and relationship mapping is agreed during integration.
Configure the response
Separate checkout and seller-payout policy. Use event-scoped conditions and list influence rather than treating an approved card as approval for the entire marketplace relationship.
Investigate and learn
Walk the linked profiles and collect related activity in a case. A seller-risk queue and a buyer-fraud queue can use different checklists while preserving the connected evidence.
02A seller account changes access and payout details
Connect the context
Join seller authentication, account changes and payout requests. Historical profiles show what is new about this session and instrument.
Configure the response
Evaluate access and payout separately, with application-owned enforcement. SENTR returns a decision; it is not an escrow or settlement service.
Investigate and learn
Investigate the session and related accounts, record whether takeover was confirmed and retain the reviewer’s reason. Use that outcome to review rules and scoped lists.
No. SENTR can evaluate mapped events alongside payment providers and internal systems. It is an independent decision and operations layer, not a payment processor. You need a supported data path and explicit response handling; named-provider integrations are not assumed to be prebuilt connectors.
Can buyer and seller risk be investigated together?
SENTR can connect mapped buyer, seller, device, payment and payout activity through shared identifiers. A linked relationship is evidence to inspect—not a verdict that every connected account is fraudulent. Configure event-specific controls and record the outcome of human review.