Unfortunately, the only way to update the app is through Google Play or App Store. Due to Google and Apple policies, we can't offer any other way to pay for the update. You can add a credit/debit card to your Google Play account and then, you can remove it again if you don't want to use it anymore.
Ideas
Hi,
Thank you for contacting us!
Unfortunately, the only way to update the app is through Google Play or App Store. Due to Google and Apple policies, we can't offer any other way to pay for the update. You can add a credit/debit card to your Google Play account and then, you can remove it again if you don't want to use it anymore.
Kind regards,
Juan