[ 'domain' => '', 'secret' => '', 'endpoint' => 'api.mailgun.net', // api.eu.mailgun.net for EU ], 'mandrill' => [ 'secret' => '', ], 'ses' => [ 'key' => '', 'secret' => '', 'region' => 'us-east-1', ], 'sparkpost' => [ 'secret' => '', ], 'stripe' => [ 'model' => 'User', 'secret' => '', ], ];