Thank you for your post.
Bar code scanning was introduced in FileMaker 13. Therefore, hosting the file in FileMaker Server 12 would be unavailable. You would need FileMaker Server 13 along with FileMaker Go 13 for bar code scanning.
Another option are some third-party bar code readers that could be used in FileMaker Go 12. You will need to check with those third-party companies. See Knowledge Base Article #7721 for more information:
TS Gal, can you double check this. New features (like popovers, slide controls, invisible, etc.) that are specific to the client will work fine when you have FM Go 13 and FileMaker Server 12. I believe barcodes will also work.
it would be great if you were to respond to the question