An Azure service that is used to provision Windows and Linux virtual machines.
@WisonHii Billing will depend on the offer that is listed in the VM properties. You can review this on the VM overview page.
If you still find any difficulties in pricing/billing, free billing and subscription management support is provided. The Billing and Subscription team would be the best to provide more insight and guidance on the pricing. If you have further questions please open a ticket with them.
Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution.