Updating your payment details will depend on your phone platform and the mode of payment used.
https://support.apple.com/en-gb/118293
For Android users, please see below steps to update your payment method in the Play Store:
https://support.google.com/googleplay/answer/4646404?hl=en-GB&co=GENIE.Platform%3DAndroid&oco=1
**If you have an Android device and Delm8 is not in your subscriptions list in the Play Store, please contact us at info@delm8.co.uk.