Sometimes during high load on the Bitcoin network, and especially with obsolete wallets that don't use proper fee estimations, transactions don't confirm quickly. Your money is completely safe during this time - if your transaction ends up not being confirmed, the bitcoins will appear in your wallet again.
If you included a high enough fee (we tell you the minimum at the payment screen), orders under $200 will be delivered immediately without waiting for a confirmation.
In order to avoid these problems, we recommend:
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Use updated wallets that support Segwit addresses and are good at fee estimation.
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Use the Lightning Network, a payment protocol for bitcoin that allows instant transactions with unfairly cheap transaction fees. Here is a good resource to learn more about Lightning wallets.
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Learn about how to easily start using Lightning Network.
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Use a Bitrefill account, where you can prepay a balance and do multiple purchases instantly and without fee, learn about Bitrefill Accounts
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Read this guide about how to save money on Bitcoin Network fees and deal with confirmation delays.
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You may also learn about how Bitcoin fees work.