PayPalOneTouch/src/main/java/com/paypal/android/sdk/onetouch/core/Request.java
@SuppressWarnings("unchecked")
    public T cancelUrl(String scheme, String host) {
        mCancelUrl = scheme + "://" + redirectURLHostAndPath() + host;
        return (T) this;
    }
@SuppressWarnings("unchecked")
    public T cancelUrl(String scheme, String host) {
        mCancelUrl = scheme + "://" + redirectURLHostAndPath() + host;
        return (T) this;
    }
Defines the host to be used in the cancellation url for browser switch (the package name will
be used as the scheme)