Add PHP7 type annotations to Payment classes
This PR is the next installment in the PHP7 type annotation series. This updates the Payment classes.
Please review: @ahoffmann @weizhong-wang @lloyd-carter @KJOYNER
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This PR is the next installment in the PHP7 type annotation series. This updates the Payment classes.
Please review: @ahoffmann @weizhong-wang @lloyd-carter @KJOYNER