Hi, I have the same problem we had to solve last year.
On May 29, 2016 I purchased a Snoworange subscription on Google Play for Doit.im Pro Service (Doit.im for Android).
This year the payment has been regularly made by PayPal on May 29, 2018 but, as happened last year, the pro version is no longer working on my smartphone and on my computer with the following message : "Your Pro account has expired. Please renew to enjoy better service".

Below the payment details from the enclosed e-mails.
Payment details from Google Play e-mail:
Order number: GPA.1351-9285-8940-77382..1
Order date: 29-mag-2018 19.21.33 CEST
Payment details from Paypal e-mail:
29 mag 2018 19:21:31 CEST
Transaction code: 15642371TT8362201

Greetings.