Fatal Error on Checkout
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We are receiving this fatal error:
Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class WC_Amazon_Payments_Advanced does not have a method “checkout_message” in wp-includes/class-wp-hook.php:324
Although we have added public function checkout_message(){} in that class and it seems the error is resolved but payment gateway is not visible.
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