There are four ways to get the invoice Bitcoin address into your wallet: (1) manually select and copy the Bitcoin address from the CoinGate invoice to your wallet; (2) click the copy button, and paste the invoice Bitcoin address in your wallet; (3) click Pay with Bitcoin on the invoice, which will open up Electrum with the correct invoice Bitcoin address and payment value already inserted in the required fields; (4) scan the QR code with your mobile Bitcoin wallet or with Electrum.