Create retrieveVoidInfo function

[aceraven777]

okay, now I think thats the issue, because the account given to me was for https://manager-sandbox.paymaya.com/

Well, Thank you for the cooperation and fast response. I also want to suggest adding a retrieveVoidInfo because as of now there's only retrieveRefundInfo on you CheckoutAPIManager.

https://s3-us-west-2.amazonaws.com/developers.paymaya.com.pg/payment-vault/paymentvault.html#void-void-endpoints-get-1

Originally posted by @kdwight in #15 (comment)