‘Error#15005’ is a common error code for the Paypal payment gateway. It means the card has been declined, either due to lack of funds or the card-issuing bank has blocked the transaction.
If you have available funds, contact your credit/debit card issuers bank and check if the fraud department is blocking the transaction due to an unfamiliar online sale or you may need to enable your card for international transactions. This issue is usually cleared up quickly.
***Also, you can purchase our app Academic IELTS Help, in your app store and then link the app to the web account. It is another way to get access to the website. The app and the website work together as one account/software. https://play.google.com/store/apps/details?id=com.app.academicieltschannel