refreshOAuth2Token got the following response:<br />{
  "error": "invalid_request",
  "error_description": "Missing required parameter: refresh_token"
}using refreshToken {"id":473,"date":"2016-01-12T20:43:20","date_gmt":"2016-01-12T19:43:20","guid":{"rendered":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/wordpress\/?page_id=473"},"modified":"2018-04-10T11:04:17","modified_gmt":"2018-04-10T09:04:17","slug":"2016-2","status":"publish","type":"page","link":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/?page_id=473","title":{"rendered":"2016"},"content":{"rendered":"<div id='pwaheader'><span class='lang_gallery'>(2016) 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":2320,"menu_order":4,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/index.php?rest_route=\/wp\/v2\/pages\/473"}],"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=473"}],"version-history":[{"count":3,"href":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/index.php?rest_route=\/wp\/v2\/pages\/473\/revisions"}],"predecessor-version":[{"id":621,"href":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/index.php?rest_route=\/wp\/v2\/pages\/473\/revisions\/621"}],"up":[{"embeddable":true,"href":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/index.php?rest_route=\/wp\/v2\/pages\/2320"}],"wp:attachment":[{"href":"http:\/\/www.mbnp.archidiecezja.wroc.pl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=473"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}