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A non-admin tapping a subscription, individual-links or QR-links button was served whatever email that button carried. Those keyboards outlive the chat they were sent to (group chats, forwarded cards, a client whose tgId was later revoked), so the email in the callback data cannot authorise itself. The lookup the self-service usage command already performs now decides whether the callback is served. The gate also has to read the email at all: encodeQuery replaces any callback payload past 64 chars with a hash, so for a client whose email is long enough the non-admin path saw a bare hash and dropped the tap without a word. The raw data is now decoded before the gate, which is the same decode the admin path already performs, and an email the caller cannot prove is answered with the generic error instead of silence.