WordPressにOAuth認証してRailsでREST APIを叩いて記事を投稿したいです。

▼参考にしている記事は以下です。
https://fromatom.hatenablog.com/entry/2022/01/30/190942

以下のコードのputs request_token.authorize_urlのところがnilになります。
欲しいのは、認証するためのURLです。認証自体はうまくいっているように見受けられます。

ruby
1class WordpressClient
2  WP_CLIENT_KEY         = ENV['WP_CLIENT_KEY'].freeze
3  WP_SECRET_KEY         = ENV['WP_SECRET_KEY'].freeze
4  WP_OAUTH_ENDPOINT     = ENV['WP_OAUTH_ENDPOINT'].freeze
5  WP_REQUEST_TOKEN_PATH = ENV['WP_REQUEST_TOKEN_PATH'].freeze
6  WP_AUTHORIZE_PATH     = ENV['WP_AUTHORIZE_PATH'].freeze
7  WP_ACCESS_TOKEN_PATH  = ENV['WP_ACCESS_TOKEN_PATH'].freeze
8  WP_CALLBACK_URL       = ENV['WP_CALLBACK_URL'].freeze
9
10  class << self
11    def post
12      fetch(:post)
13    end
14
15    private
16
17    def fetch(method, headers = {})
18      response = begin
19                   consumer = OAuth::Consumer.new(
20                     WP_CLIENT_KEY,
21                     WP_SECRET_KEY,
22                     site:               WP_OAUTH_ENDPOINT,
23                     request_token_path: WP_REQUEST_TOKEN_PATH,
24                     authorize_path:     WP_AUTHORIZE_PATH,
25                     access_token_path:  WP_ACCESS_TOKEN_PATH
26                   )
27                   request_token = consumer.get_request_token(oauth_callback: WP_CALLBACK_URL)
28                   puts request_token.authorize_url
29                   oauth_verifier = Readline.readline("oauth_verifier >")
30                   access_token   = request_token.get_access_token(oauth_verifier: oauth_verifier)
31                   binding.pry
32                 rescue RestClient::ExceptionWithResponse => e
33                   e.response
34                 end
35      if response.code == 200
36        JSON.parse(response)
37      else
38        nil
39      end
40    rescue => e
41      nil
42    end
43  end
44end
45

request_tokenの値は以下になります。

ruby
1=> #<OAuth::RequestToken:0x0000000110e52868
2 @consumer=
3  #<OAuth::Consumer:0x0000000110b0b240
4   @debug_output=nil,
5   @http=#<Net::HTTP localhost:80 open=false>,
6   @http_method=:post,
7   @key="ZBQRW2E4fKam",
8   @options=
9    {:signature_method=>"HMAC-SHA1",
10     :request_token_path=>"/oauth1/request",
11     :authenticate_path=>"/oauth/authenticate",
12     :authorize_path=>"/oauth1/authorize",
13     :access_token_path=>"/oauth1/access",
14     :proxy=>nil,
15     :scheme=>:header,
16     :http_method=>:post,
17     :debug_output=>nil,
18     :body_hash_enabled=>true,
19     :oauth_version=>"1.0",
20     :site=>"http://localhost/hoge"},
21   @secret="ZahmImS0oMeOFj8BJPjMFEHmOPyAWkyhhgk2XfDGwuWk4pDN">,
22 @params=
23  {:"<br />\n<b>Warning</b>:  WP_REST_OAuth1::normalize_parameters(): Argument #2 ($value) must be passed by reference, value given in <b>/Users/hoge_name/Dropbox/Sites/hoge/wp-content/plugins/rest-api-oauth1/lib/class-wp-rest-oauth1.php</b> on line <b>672</b><br />\n<br />\n<b>Warning</b>:  WP_REST_OAuth1::normalize_parameters(): Argument #2 ($value) must be passed by reference, value given in <b>/Users/hoge_name/Dropbox/Sites/hoge/wp-content/plugins/rest-api-oauth1/lib/class-wp-rest-oauth1.php</b> on line <b>672</b><br />\n<br />\n<b>Warning</b>:  WP_REST_OAuth1::normalize_parameters(): Argument #2 ($value) must be passed by reference, value given in <b>/Users/hoge_name/Dropbox/Sites/hoge/wp-content/plugins/rest-api-oauth1/lib/class-wp-rest-oauth1.php</b> on line <b>672</b><br />\n<br />\n<b>Warning</b>:  WP_REST_OAuth1::normalize_parameters(): Argument #2 ($value) must be passed by reference, value given in <b>/Users/hoge_name/Dropbox/Sites/hoge/wp-content/plugins/rest-api-oauth1/lib/class-wp-rest-oauth1.php</b> on line <b>672</b><br />\n<br />\n<b>Warning</b>:  WP_REST_OAuth1::normalize_parameters(): Argument #2 ($value) must be passed by reference, value given in <b>/Users/hoge_name/Dropbox/Sites/hoge/wp-content/plugins/rest-api-oauth1/lib/class-wp-rest-oauth1.php</b> on line <b>672</b><br />\n<br />\n<b>Warning</b>:  WP_REST_OAuth1::normalize_parameters(): Argument #2 ($value) must be passed by reference, value given in <b>/Users/hoge_name/Dropbox/Sites/hoge/wp-content/plugins/rest-api-oauth1/lib/class-wp-rest-oauth1.php</b> on line <b>672</b><br />\noauth_token"=>
24    "FZjRlE1sNE5M7s64iC2aEgB6",
25   "<br />\n<b>Warning</b>:  WP_REST_OAuth1::normalize_parameters(): Argument #2 ($value) must be passed by reference, value given in <b>/Users/hoge_name/Dropbox/Sites/hoge/wp-content/plugins/rest-api-oauth1/lib/class-wp-rest-oauth1.php</b> on line <b>672</b><br />\n<br />\n<b>Warning</b>:  WP_REST_OAuth1::normalize_parameters(): Argument #2 ($value) must be passed by reference, value given in <b>/Users/hoge_name/Dropbox/Sites/hoge/wp-content/plugins/rest-api-oauth1/lib/class-wp-rest-oauth1.php</b> on line <b>672</b><br />\n<br />\n<b>Warning</b>:  WP_REST_OAuth1::normalize_parameters(): Argument #2 ($value) must be passed by reference, value given in <b>/Users/hoge_name/Dropbox/Sites/hoge/wp-content/plugins/rest-api-oauth1/lib/class-wp-rest-oauth1.php</b> on line <b>672</b><br />\n<br />\n<b>Warning</b>:  WP_REST_OAuth1::normalize_parameters(): Argument #2 ($value) must be passed by reference, value given in <b>/Users/hoge_name/Dropbox/Sites/hoge/wp-content/plugins/rest-api-oauth1/lib/class-wp-rest-oauth1.php</b> on line <b>672</b><br />\n<br />\n<b>Warning</b>:  WP_REST_OAuth1::normalize_parameters(): Argument #2 ($value) must be passed by reference, value given in <b>/Users/hoge_name/Dropbox/Sites/hoge/wp-content/plugins/rest-api-oauth1/lib/class-wp-rest-oauth1.php</b> on line <b>672</b><br />\n<br />\n<b>Warning</b>:  WP_REST_OAuth1::normalize_parameters(): Argument #2 ($value) must be passed by reference, value given in <b>/Users/hoge_name/Dropbox/Sites/hoge/wp-content/plugins/rest-api-oauth1/lib/class-wp-rest-oauth1.php</b> on line <b>672</b><br />\noauth_token"=>
26    "FZjRlE1sNE5M7s64iC2aEgB6",
27   :oauth_token_secret=>"mXyEjnDNl2zWEL7Tj31ImGmyYxKtV3I7UJTE3FXxTljjPeQH",
28   "oauth_token_secret"=>"mXyEjnDNl2zWEL7Tj31ImGmyYxKtV3I7UJTE3FXxTljjPeQH",
29   :oauth_callback_confirmed=>"true",
30   "oauth_callback_confirmed"=>"true"},
31 @secret="mXyEjnDNl2zWEL7Tj31ImGmyYxKtV3I7UJTE3FXxTljjPeQH",
32 @token=nil>