CoinGate bitcoin payment gateway Magento plugin.
Login to Magento Admin Panel.
Go to System » Magento Connect » Magento Connect Manager.
Find Paste extension key to install, enter this url:
http://connect20.magentocommerce.com/community/CoinGate_For_Magento, click Install, then click Proceed.
Click Return to Admin.
Go to System » Configuration.
Click on Payment Methods in SALES block.
In Payment Methods find and click on Bitcoin via CoinGate.com.
Set Enabled to Yes.
Set Currency you want to receive to the currency in which you wish to receive your payouts from CoinGate. Please note, that if you set it to Euros or US Dollars you will have to get verified as a merchant (to do that, login to your CoinGate account and click Verification. If you set your receive currency to Bitcoin you will not have to get verified.
Enter your API credentials: App ID, API Key, API Secret (to create your API credentials: login to your CoinGate account, go to API » Apps, click +New App, then click Submit).
Click Save Config.
If the plugin does not work, go to System » Cache Management and click on the Flush Cache Storage button.