shouldOverrideCouponPresenting

This callback is triggered immediately after the coupon was downloaded (the download of the coupon may be triggered by a shake event). Give the host application a chance to take over the control for presenting coupons This callback is always triggered on the main thread.
adBaseManager: the AdBaseManager that is associated with this coupon
couponUri: the Uri for the local file that contains the coupon
returns true if the host application wants to present itself the coupon, otherwise return false and in this case the coupon will be presented by the SDK.
warning Please take note that this callback is triggered only for interactive ads of type 'Download Coupon'.