Method to use the refresh token

Dylan Donkersgoed → made their first commit to this issue’s fork.

wulff → changed the visibility of the branch 2923419-method-to-use to hidden.

Hi, is this going to be merged soon

I tested this and it works for me +1

Fixing tag

Re-rolled the MR for v3 and made sure refreshTokens() stays closer to how retrieveTokens() behaves.

I attached a patch that used json_decode() rather than Json::decode(), fixed that.