Explain how: ionic app connecting to private wordpress.com api

Hi: I am building an ionic application. I am setting up a private [login to view URL] site that has certain posts that I want my ionic application to access. I have set up the wordpress api endpoint that my ionic application can access--it works so long as the site is kept public. I now want to figure out how to: have my ionic app access the [login to view URL] data when the [login to view URL] site is private. Is this something you can explain to me? I am familiar with Ionic, but new to [login to view URL] and api access. It is important to me that the users of the ionic application never have to do any logging in--so the standard oAuth procedures do not seem applicable. The answer may be just giving my ionic application a token that allows access to the private wordpress site; but I am not aware how to do that. If this is something you can explain to me, I would pay for a skype call where you walk me through or pay for example code with an explanation. Thanks.