What are the best practices of charging storage frees from user? Will I have to charge the storage fees every time they insert the data?
Can I charge storage fees without making a function [payable]?
How should I charge storage fees?
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What are the best practices of charging storage frees from user?
There is a Standard designed for this use case:
You can use the interface of this standard in rust from this implementation in near-sdk-rs.
In particular one useful example, is the implementation of this trait for FungibleToken. This functions are exposed using this macro.
Will I have to charge the storage fees every time they insert the data?
If it is clear what is the amount of data a single user requires, they only need to call storage_deposit once, with the required deposit. Optionally they can call storage_withdraw / storage_unregister to get a refund and remove their data.
Can I charge storage fees without making a function [payable]?
No. But if you follow previous standard, only storage_deposit needs to be #[payable] and not other functions in your contract.
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