At the moment I'm finalizing the purchase, the site does not offer the option to select the payment method, it just says that:
This store can’t accept payments right now.
Is the Tui-shop.top website with intability in the system? When does it return to normal operation?
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It sounds like your payment provider may be in test mode. Which payment provider are you using? If you're using Shopify Payments, can you please go to Settings > Payment Providers > Manage from your admin? If you scroll to the bottom of the page, you'll see an option to disable test mode.
Perhaps your store is a development store? (Partner Program)
You can't test your store using real transactions in a development store. Real transactions are transactions that are processed through a payment provider that is not in test mode, and that use real payment information such as a valid credit card number. If you need to test with real transactions, then you need to transfer the development store to a paid plan.
Take a look at the documentation on testing orders in development stores here.
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