Should pro-site send an email receipt to the user like

HI,

Should pro-site send an email receipt to the user like in pdf format or just plain text. the reason why i ask is because, am testing it on a project and here's what i saw after the user upgrade their plan. PLease view image prosite.png.

and here's what i received in the email notification.

Thank you for becoming a pro member!

We have received your first subscription payment and you can now access all TEST features!

the question is. which one of the options above it should be, should it sent a pdf receipt invoice or just the plain text.

Thanks.