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Checkout runs on Stripe. If the payment window closes early, or the app has not picked up the new plan yet, you can finish from the return page without starting a duplicate subscription blindly.
1

Stay on the checkout return page if you see it

After Stripe, Vocab Monster checks the session. Payment received means Stripe finished; the app then takes you to Home once billing has updated.
2

If checkout is still open

If the page says checkout is still in progress, choose Refresh status or Return to checkout to finish paying. You can also open Account or Pricing.
3

If you already paid

Starting checkout again while you already have paid access sends you to Account → Billing instead of charging you again.
4

If status cannot be checked

Use Refresh status. If it still fails, wait a minute, confirm the charge in your email or bank app, then check Billing before paying again. Email help@vocabmonster.com with the approximate time and the plan you selected. Do not send your full card number.
Purchased AI credit packs also use Stripe Checkout from Billing. The same refresh and “already paid” behavior applies to subscription checkout; credit packs are one-time charges.