refreshOAuth2Token got the following response:<br />{
  "error": "invalid_request",
  "error_description": "Missing required parameter: refresh_token"
}using refreshToken {"id":2036,"date":"2016-09-05T20:48:25","date_gmt":"2016-09-05T18:48:25","guid":{"rendered":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/?page_id=2036"},"modified":"2017-01-17T12:50:52","modified_gmt":"2017-01-17T11:50:52","slug":"2004-2","status":"publish","type":"page","link":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/?page_id=2036","title":{"rendered":"2004"},"content":{"rendered":"<div id='pwaheader'><span class='lang_gallery'>(2004) Gallery<\/span><span class='total_images'> photos in  albums<\/span><\/div>\n<div style='clear: both'><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":7,"featured_media":0,"parent":2324,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/index.php?rest_route=\/wp\/v2\/pages\/2036"}],"collection":[{"href":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/index.php?rest_route=\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2036"}],"version-history":[{"count":1,"href":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/index.php?rest_route=\/wp\/v2\/pages\/2036\/revisions"}],"predecessor-version":[{"id":2037,"href":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/index.php?rest_route=\/wp\/v2\/pages\/2036\/revisions\/2037"}],"up":[{"embeddable":true,"href":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/index.php?rest_route=\/wp\/v2\/pages\/2324"}],"wp:attachment":[{"href":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2036"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}