Problems with application fee

[bearn777]

From official documentation (https://stripe.com/docs/upgrades#2019-03-14)
"The application_fee parameter on invoice API methods and the application_fee field on the invoice object have both been renamed to application_fee_amount."

In this case setApplicationFee method does not work correct and you will always get error, that parameter does not exists

[jupediaz]

This issue seems closed, but still not solved on current code.

On src/Message/AuthorizeRequest.php

        if ($this->getApplicationFee()) {
            $data['application_fee'] = $this->getApplicationFeeInteger();
        }

Should be changed to

        if ($this->getApplicationFee()) {
            $data['application_fee_amount'] = $this->getApplicationFeeInteger();
        }

I have created a pull request to solve this: #172

Hope everything is fine and we can have this fixed.

Thank you very much.