I am visiting Ghana to exit do I have to pay a declaration fee and for how much?

It's a SCAM!
There is NO such fee.

No, there is no such thing.

Are you sure that there is not someone else that wants you to send them money ?
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Anyone asking for this, is part of a scam

No, there is no such fee. All you do to exit is pay for your airfare.

No, there is no declaration fee... sounds like a scam.