api_helpers.rb

module ApiAuthOverride
  [:get, :post, :put, :delete, :patch].each do |method|
    define_method(method) do |url, params=nil|
      access_token = { access_token: current_token }
      super(url, params ? params.merge(access_token) : access_token)
    end
  end
end

# ...
RSpec.configure do |c|
  c.include ApiAuthOverride, api_auth: true
end