Optional. If present, then retrieve the next batch of results from the
preceding call to this method. page_token must be the value of
next_page_token from the previous response. The values of other method
parameters should be identical to those in the previous call.
This can be used to retrieve more than 100 issues with multiple API
calls. For example: 'ODFBMzQ3MDYtNzQxNy00RDZGLThDNjE1MEFDMkM4MTQ3NDQ='