diff --git a/app/services/dataminer.rb b/app/services/dataminer.rb
index 973640a..641bf10 100644
--- a/app/services/dataminer.rb
+++ b/app/services/dataminer.rb
@@ -3,6 +3,120 @@
 class Dataminer
   include HTTParty
 
-  bot_uid = '35121757'
-  game_version = '1668657628'
+  BOT_UID = '39094985'
+  GAME_VERSION = '1741068713'
+
+  base_uri 'https://game.granbluefantasy.jp'
+  format :json
+
+  HEADERS = {
+    'Accept' => 'application/json, text/javascript, */*; q=0.01',
+    'Accept-Language' => 'en-US,en;q=0.9',
+    'Accept-Encoding' => 'gzip, deflate, br, zstd',
+    'Content-Type' => 'application/json',
+    'DNT' => '1',
+    'Origin' => 'https://game.granbluefantasy.jp',
+    'Referer' => 'https://game.granbluefantasy.jp/',
+    'User-Agent' => 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36',
+    'X-Requested-With' => 'XMLHttpRequest'
+  }.freeze
+
+  attr_reader :page, :cookies
+
+  def initialize(page:, access_token:, wing:, midship:, t: 'dummy')
+    @page = page
+    @cookies = {
+      access_gbtk: access_token,
+      wing: wing,
+      t: t,
+      midship: midship
+    }
+  end
+
+  def fetch
+    timestamp = Time.now.to_i * 1000
+    response = self.class.post(
+      "/#{page}?_=#{timestamp}&t=#{timestamp}&uid=#{BOT_UID}",
+      headers: HEADERS.merge(
+        'Cookie' => format_cookies,
+        'X-VERSION' => GAME_VERSION
+      )
+    )
+
+    raise AuthenticationError if auth_failed?(response)
+
+    response
+  end
+
+  def fetch_character(granblue_id)
+    timestamp = Time.now.to_i * 1000
+    url = "/archive/npc_detail?_=#{timestamp}&t=#{timestamp}&uid=#{BOT_UID}"
+    body = {
+      special_token: nil,
+      user_id: BOT_UID,
+      kind_name: '0',
+      attribute: '0',
+      event_id: nil,
+      story_id: nil,
+      style: 1,
+      character_id: granblue_id
+    }
+
+    puts "\n=== Request Details ==="
+    puts "URL: #{url}"
+    puts 'Headers:'
+    puts HEADERS.merge(
+      'Cookie' => format_cookies,
+      'X-VERSION' => GAME_VERSION
+    ).inspect
+    puts 'Body:'
+    puts body.to_json
+    puts '===================='
+
+    response = self.class.post(
+      url,
+      headers: HEADERS.merge(
+        'Cookie' => format_cookies,
+        'X-VERSION' => GAME_VERSION
+      ),
+      body: body.to_json
+    )
+
+    puts "\n=== Response Details ==="
+    puts "Response code: #{response.code}"
+    puts 'Response headers:'
+    puts response.headers.inspect
+    puts 'Raw response body:'
+    puts response.body.inspect
+    begin
+      puts 'Parsed response body (if JSON):'
+      puts JSON.parse(response.body).inspect
+    rescue JSON::ParserError => e
+      puts "Could not parse as JSON: #{e.message}"
+    end
+    puts '======================'
+
+    raise AuthenticationError if auth_failed?(response)
+
+    JSON.parse(response.body)
+  end
+
+  private
+
+  def format_cookies
+    cookies.map { |k, v| "#{k}=#{v}" }.join('; ')
+  end
+
+  def auth_failed?(response)
+    return true if response.code != 200
+
+    begin
+      parsed = JSON.parse(response.body)
+      parsed.is_a?(Hash) && parsed['auth_status'] == 'require_auth'
+    rescue JSON::ParserError
+      true
+    end
+  end
+
+  class AuthenticationError < StandardError; end
 end