Following are my suggestion of payment.
While sending maintenance paid email confirmation email , in subject line AND/OR body please add "TransactionID" also attachment name of the PDF can be TransactionID.PDF so when we download receipt it can be easily identify using transactionIdright now its display common name "mnt-payment-receipt"
in the same email Could you provide hyperlinked on Patent number which can be clickable and redirect to the correct case on the fee portal
Also provide feature to notify any other user rather then Login user email. We want to notify to customer or finance department so we can add additional email so email can go to other person also.
in below portal , last column is "Statment" where hyperlinked called "statement" , could you please provide real receipt name ? instead of hyperlinked "Statement" keyword. For ex ("E20205K434210029")