PRISM Signals · preview and sandbox terms · 3 September 2026
Synthetic preview · no live market data · no payment
A fixed synthetic demonstration of how a future decision-support product could communicate a potential deal and its limitations. It does not query a marketplace, private engine, subscriber archive, or Telegram account. The public Free reading needs no payment or entitlement.
Free has no price. A separately labelled All sandbox may use a £5 monthly test amount to rehearse Stripe Checkout, renewal, cancellation, failure, and refund handling. It accepts Stripe test mode and test payment methods only: it cannot make a real charge, issue a tax invoice, buy a live service, or create a production entitlement. This first sandbox is card-test only; delayed payment methods, trials, discounts and promotion codes are not offered.
A successful test invoice can create a time-bounded, All-labelled owner projection around the fixed public synthetic fixture. It does not gate a unique signal payload or remove that fixture from Free. The amount is not a live commercial price, offer, trial, discount, VAT decision, service-level commitment, or promise that a live product will open. A live launch needs a new version of the offer and terms.
New sandbox Checkout is available only when Cambridge explicitly enables its separate test-intake posture and every dedicated Stripe test credential, Price, Product, webhook, reference secret, and portal configuration agrees. Missing or drifting configuration means unavailable. Pausing new Checkout does not remove an existing test period or its status and cancellation paths.
Checkout also requires both an active beta-interest request and a separate operator-issued, active, unexpired sandbox invitation. Interest is not an invitation; neither record is a purchase or grants access. There is no public endpoint for creating an invitation.
Checkout creation and its return page never grant access. Only a correctly signed, non-live Stripe invoice.paidevent bound to the exact local account attempt, monthly GBP test Price, subscription, and period can activate or renew the synthetic entitlement. Duplicate and out-of-order events are deduplicated or held for review rather than guessed into access.
The dedicated test portal may show test invoices, repair a test payment method, and schedule cancellation at period end. It does not offer plan switching. Scheduled cancellation preserves the already-confirmed test period; effective deletion ends it. Only a full refund of the latest confirmed period may end access early. Refund and subscription cancellation are separate Stripe facts: after a full refund, Cambridge records a cancellation obligation and blocks any later invoice from restoring access until a signed terminal subscription event resolves it.
Stripe's hosted page receives the test customer, billing, and payment details entered there. Cambridge sends only a fixed sandbox marker and random attempt reference in metadata—not its user id, account email, entitlement reference, or internal scope. The signed webhook transiently parses the event, which can include the test customer details supplied to Stripe, and retains a digest rather than the full event payload. Read the privacy noticefor the provider and local-record boundary.
The test webhook can answer a small allowlisted command set only when its server-side fixture mode and Telegram webhook secret are configured and an operator attests that the bot is new, invoice-free, has dropped pending updates, and has its privacy URL wired. Telegram and Cambridge TCG's Vercel-hosted route process the bounded update needed to answer, including Telegram/user and private-chat identifiers and command text; Cambridge stores no application update, account link, entitlement, or payment record, while provider infrastructure logs and Telegram's own records can still exist. Read the detailed Telegram preview privacy notice. Any future digital purchase completed inside Telegram must use Telegram Stars and verified payment evidence; an external web rail is not smuggled into the bot.
Pre-checkout is rejected. If a payment or refund update reaches this non-payment preview anyway, the route returns a retryable non-success response instead of acknowledging, discarding, or pretending it can fulfil the provider receipt. Do not connect the preview to a bot with invoice or payment history.
The exact private-chat command allowlist is /demo, /terms, /privacy, /support, /paysupport. The deep-link command replies only to /start demo_prism_v1. Other text, commands, and start parameters receive no reply.
A potential-deal label is not guaranteed arbitrage. Confidence is evidence quality, not profit probability. Liquidity may remain unknown. Availability, condition, authenticity, fees, tax, shipping, and time to sell can differ from any evidence later admitted by a live product.
Payment, transformation, secrecy, and channel access do not create permission to use or redistribute source data. No real evidence enters until a purpose-specific decision permitssubscriber_derived_signalfor that evidence bundle.
Questions about the preview belong with Cambridge TCG, not Telegram or Stripe. Use thecontact pageor read theproduct-flow methodology.