JBFee
Notes:
- 
member: amount The total amount the fee was taken from, as a fixed point number with the same number of decimals as the terminal in which this struct was created.
 - 
member: beneficiary The address that will receive the tokens that are minted as a result of the fee payment.
 - 
member: unlockTimestamp The timestamp at which the fee is unlocked and can be processed.
 
struct JBFee {
    uint256 amount;
    address beneficiary;
    uint48 unlockTimestamp;
}