WC_Amazon_Payments_Advanced – Checkout – PHP 8

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I encountered an error at checkout, i.e .: call_user_func_array () expects parameter 1 to be a valid callback, class ‘WC_Amazon_Payments_Advanced’ does not have a method ‘checkout_message’
With PHP 7.4, even if there is the error, everything still works.
If I activate PHP 8.0, the page doesn’t work.
How can this be solved?