Where in my dashboard do I find the invoices for purchased points?

You can find it from the Billing History in your account Profile:

https://www.mapsmadeeasy.com/billing/history/

You charged PayPal account $29.99. I don't see credit posted to my website. Please explain.

Keivan: I am not seeing any record of this in our system associated with your name. If you are using a different account please let us know what the username is. Please let us know the date of the transaction and email address it came from so we can look it up. 

Also, don't dredge up a 4 year old thread that is not directly related. Tis considered poor internet etiquette.