Open Account → Billing for the workspace that made the purchase. If it has an active Whop subscription, use that subscription's management link to open the payment-provider account. This is separate from your app customers' My subscriptions page.
The platform's Billing page is not a combined receipt archive for every payment provider. Older Stripe-backed accounts can show an invoice list when a Stripe customer is linked; that list should not be treated as a history of Whop purchases.
For a missing receipt, check the email address and payment-provider account used at checkout. If you cannot find the purchase, contact support with the workspace, approximate purchase date, amount and checkout email. Do not send a full card number.
Changing the current plan display is not evidence that an earlier payment disappeared. Support can help identify the payment and the appropriate provider path; this article does not promise that every past receipt can be reissued from the Overskill dashboard.