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Available Payment Gateways can be found under [Settings] > [Company] > [Payment Gateways] > Available. A payment gateway must be installed in order to accept live payments. Once a payment gateway is installed, it can be configured and later found under Settings > Company > Payment Gateways > Installed.
Email Templates
Email Templates can be found under [Settings] > [Company] > [Emails] > Email Templates. This section includes all emails sent by the system to clients, staff members, and those added by plugins. By default, these templates usually don't have to be modified, but it's a good idea to review them in detail anyway.
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