Free Trial Credit Card Skip: Starting Premium Without Billing Details
Product wants a card on file before trial. Growth experiments sometimes leave a back door: a mobile API that still creates trialing subscriptions with paymentMethodId=null, or a feature flag that skips Stripe Checkout.
Your goal is premium capability without attaching billing—not stealing cards.
Compare clients
Sign up through the main web flow and capture the subscription create call. Repeat on:
- Marketing landing page variants
- iOS/Android API hosts
?trial=1orskip_card=truestyle parameters buried in JS- Older
/v1/subscriptionsversus/v2
If any path returns status: trialing with empty default payment method, open gated routes: export, SSO, seated invites, higher API quotas. Screenshots of a paywalled feature working beat a status field alone.
I've seen "card required" enforced only in the React wizard while POST /api/teams accepted plan: pro_trial directly for any authenticated user.
Partner or education signup forms are frequent leftovers. A /students/start route that never collected cards may still mint the same entitlement object the paid funnel uses.
Invite-only trials are another fork. Accept an invite token, then create the subscription with collection_method: send_invoice or trial_from_plan: true even when the public site demands a card. Diff invite traffic against self-serve traffic carefully.
Time and entitlement edges
Trials that skip cards often still have end dates. Check whether:
- Extending trial via
trial_endparameter works - Cancel-at-period-end is false by default and auto-converts without a card (should fail closed—if it stays premium, that is worse)
- Multiple trials across emails on the same phone/company domain are blocked
Card-skip plus infinite trial extension is the combo that moves severity.
Also remove a card after a legitimate trial start (if the UI allows) and confirm whether entitlement drops. Some products require a card to begin, then permit deletion while keeping pro flags—another skip, just sequenced differently.
Seat-based products: start a cardless trial as owner, then invite a second mailbox you own. If invitees inherit full pro features with no billing account on the tenant, impact compounds beyond a single login.
Stay inside payment rules
Do not use stolen PANs. Prefer test mode, program-provided test cards, or flows that never hit a processor. If production requires a real card, use your own and remove it after—or stop at the API proof if policy forbids charges.
Reporting
State the intended control ("card required before trial"), the bypass path, the subscription ID, and which premium actions succeeded. Mention whether conversion to paid can occur without a method (hard fail vs silent extend).
Recommend enforcing payment-method presence in the same transaction that grants entitlement, server-side plan allowlists, and identical rules across web and mobile. Feature flags that disable billing gates should not ship to production tenants.
Card-skip bugs look small in isolation. On B2B SaaS with expensive seats, free admin panels add up quickly—say that with numbers from the public pricing page. A fourteen-day Pro seat at published list price times N cardless accounts is an easy severity paragraph.