Four causes: a payment still clearing, a custom request in progress, an email that did not arrive, or a genuine problem.
1. The payment is still clearing
Bank payments can take a day or two. You would see the item with a note saying it unlocks when your bank confirms. Nothing is wrong — see my payment says processing.
2. It is a Paid Request
Custom work is made after you order. The creator has a deadline; if they miss it, you are refunded automatically without having to ask.
3. The email did not arrive
Check spam. Everything you bought is also on your purchases screen permanently — and if you bought as a guest, use Find my purchase with the email you paid with.
4. Something is genuinely wrong
Open the purchase and choose Problem with this?. That attaches your message to the exact payment, which is what lets it be resolved quickly.
Physical products
A parcel shows its courier and tracking number once the creator marks it sent.