code: private String token(final String home, final String code)
          throws IOException {
          final String uri = this.tkhref.toString();
          return new JdkRequest(uri)
              .method("POST")
              .header("Accept", "application/xml")
              .body()
              .formParam("grant_type", "authorization_code")
              .formParam("client_id", this.app)
              .formParam("redirect_uri", home)
              .formParam("client_secret", this.key)
              .formParam(PsLinkedin.CODE, code)
              .back()
              .fetch().as(RestResponse.class)
              .assertStatus(HttpURLConnection.HTTP_OK)
              .as(JsonResponse.class)
              .json().readObject().getString("access_token");
      }
docs: Retrieve PsLinkedin access token.
  @param home Home of this page
  @param code PsLinkedin "authorization code"
  @return The token
  @throws IOException If failed