A Google Apps Add-on for Google Docs Spreadsheets that loads products via Magento REST API into a sheet. After editing, you can sync changes back to Magento server

If you are getting the error "The state token is invalid or has expired. Please try again."

Increase size of the callback_url columns in magento

ALTER TABLE oauth_consumer MODIFY callback_url VARCHAR(512);
ALTER TABLE oauth_consumer MODIFY rejected_callback_url VARCHAR(512);
ALTER TABLE oauth_token MODIFY callback_url VARCHAR(512);

http://blog.kupriyanov.com/2015/10/solved-state-token-is-invalid-or-has.html

• Add oAuth1 library Mb2Vpd5nfD3Pz-_a-39Q4VfxhMjh3Sh48