Bitcoin payments usually require 6 confirmations before the transfer is marked as complete. Depending on the mining fee paid, a transfer will be considered high or low priority, so generally speaking, the higher the mining fee, the quicker the settlement.
Bitcoin is a decentralized digital currency controlled by a massive open-source network of people, you can use third-party services to check if your payment successfully transferred. Just enter in your block or transaction ID in the search bar. Once your block or transaction ID is located, the status of the transfer will appear.
blockchain.info
www.blocktrail.com/BTC