Best practices for delcaring variables that will never change is to be declared as constant
Is delared as immutable, declaring it this way should be only if it's going to be assigned in constructor and only once. - This is not happening in the contract.
The name of the variable should be FIXED_FEE
- separating the words with underscore making it more easy to read.
This will have impact on Gas fees and also on code readability.
Manual review
I recoment changing the declaration to:
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