marketing-analytics/activation/sheets-based-installer/src/apps_script/pages/explicit_auth.html [119:157]:
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      }

      /**
       * Redeems authorization code for OAuth refresh token.
       */
      async function exchangeCode() {
        const clientId = document.getElementById('clientId').value;
        const clientSecret = document.getElementById('clientSecret').value;
        const urlWithCode = document.getElementById('urlWithCode').value;
        if (urlWithCode) {
          const code = urlWithCode.split('code=')[1].split('&')[0];
          const parameters = {
            grant_type: 'authorization_code',
            redirect_uri: REDIRECT_URI,
            client_id: clientId,
            client_secret: clientSecret,
            code,
          };
          const response = await fetch(`${OAUTH_BASE_URL}token`, {
            method: 'POST',
            headers: {
              'Content-Type': 'application/x-www-form-urlencoded;charset=UTF-8',
            },
            body: getQueryString(parameters),
          });
          const token = await response.json();
          const secret = {
            token,
            client_id: clientId,
            client_secret: clientSecret,
          };
          const formattedJSON = JSON.stringify(secret, null, 2);
          document.getElementById('token').value = formattedJSON;
        }
      }

      /**
       * Enables the button.
       */
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marketing-analytics/activation/sheets-based-installer/src/apps_script/pages/oauth.html [97:135]:
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      }

      /**
       * Redeems authorization code for OAuth refresh token.
       */
      async function exchangeCode() {
        const clientId = document.getElementById('clientId').value;
        const clientSecret = document.getElementById('clientSecret').value;
        const urlWithCode = document.getElementById('urlWithCode').value;
        if (urlWithCode) {
          const code = urlWithCode.split('code=')[1].split('&')[0];
          const parameters = {
            grant_type: 'authorization_code',
            redirect_uri: REDIRECT_URI,
            client_id: clientId,
            client_secret: clientSecret,
            code,
          };
          const response = await fetch(`${OAUTH_BASE_URL}token`, {
            method: 'POST',
            headers: {
              'Content-Type': 'application/x-www-form-urlencoded;charset=UTF-8',
            },
            body: getQueryString(parameters),
          });
          const token = await response.json();
          const secret = {
            token,
            client_id: clientId,
            client_secret: clientSecret,
          };
          const formattedJSON = JSON.stringify(secret, null, 2);
          document.getElementById('token').value = formattedJSON;
        }
      }

      /**
       * Enables the button.
       */
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