Wordpress using WP Printable Gift Certs, are gift certificates able to be customized?

I'm using WordPress 4.3.1 with plugin WP Printable Gift Certs. After purchase of a gift certificate the recipient is emailed a printable gift certificate that looks like this:

My questions are:

1. Are these sent to the recipients email from Paypal or the plugins php?
2. And is it able to be customized with a logo and background in either case?

I've searched the php files for the plugin but I haven't found anything that I recognize as being a certificate (name fields, amount fields, etc,.) that is being assembled and emailed. I'm very lost but I want to customize the gift certificates.

via Chebli Mohamed