You can read further about the Huawei AppGallery auto debit with Touch 'n Go eWallet in the auto debit section within the User Terms and Conditions
Below are the articles that may be useful for you :
What is Huawei AppGallery auto debit with Touch 'n Go eWallet?
Can Touch 'n Go eWallet be used for Huawei AppGallery in other countries?
Are there any additional fees when using Touch 'n Go eWallet for Huawei AppGallery purchases?