Depending on your device, your Robokiller subscription payments are processed through Apple's App Store or the Google Play Store. Here's how you can update your billing method for both platforms:

iOS

1. Open the App Store app on your device.
2. Select your profile icon, located in the top right corner.
3. Tap your name, displaying your Apple ID.
4. Select Manage Payments.
5. Choose the payment method you'd like to modify.
6. Tap Edit. Ensure that your name and billing address match the information registered with your bank or card provider.
7. Once verified, tap Done.

Android

1. Visit play.google.com.
2. Click on your profile icon at the top right.
3. Navigate to Payments & Subscriptions and then Payment Methods.
4. Locate the payment method you wish to update and select Edit.
5. Modify the necessary details.
6. After making the changes, click Update.

Please remember to keep your billing information current to ensure uninterrupted service with your Robokiller subscription!