Add AuthorizePayloadsSpec.Access hasAuthority

[rwinch]

Summary

We should add Add AuthorizePayloadsSpec.Access hasAuthority(String) method.

[eddumelendez]

Hi @rwinch I can take this issue. Some friends are starting contributing so I can work this one with them. /cc @munilvc

[rwinch]

Thanks @eddumelendez! That would be great. We'd like to try and have this done by Friday if possible. Do you think that could happen?

[eddumelendez]

we will work on it in the next hours :)