How can I select just a handful or products to include in an offer?
Create a hidden collection, and add hand-picked products to it.
Separate this collection from regular ones by naming it "Special Offer something", so it's easy to find later.
What are the known limitations? (these apply to all apps which duplicate variants or products, we're the only ones telling you in advance)
Products in discounted collections should have a maximum of 2 existing options (we'll add a 3rd, and Shopify allows only up to 3 options).
Products in discounted collections should have a maximum of 50 existing variants (we'll double those, and Shopify allows only up to 100 variants).
Inventory management apps (e.g. StichLabs) aren't compatible with apps duplicating variants or products, such as this one. Although we do update Shopify Inventory to make up for orders with duplicated variants, StichLabs has the "master" version of inventory and will overwrite our updates.
The new Facebook and Pinterest channels will not list products part of the offers. This is a limitation applicable to all offer apps which duplicate variants, and only while the offers are active.
Incompatible apps: ShopPad (Solution: Uninstall ShopPad. If you theme is made after 2014, it works fine on mobile too), Oberlo (it doesn't recognize new variants added to products after the initial setup)
Incompatible themes: Lookbook, Shoptimized (theme coding is way too convoluted)
Digital downloads don't work properly. Because of the duplicate variants, files would have to be re-assigned to duplicated variants.
Gift cards cannot be offered discounted. For gift cards, the exact gift price must be paid.
AJAX Cart popups need to be disabled in theme preferences. All other popups, such as Coupons or News letter sign up, work fine.
Can one make fraudulent orders?
Due to how Shopify and these kind of apps work (by creating hidden product variants), a software engineer can actually manage to add to cart the discounted variants, and skip the check done by the app by going directly to checkout. One could also change quantities and directly click on checkout button, skipping cart Update.
That's why we setup a system which checks every order againts current active offers. When it finds a potential problem, it sends warning emails with a link to order details for manual review.
The offers work with Internet explorer 10 or newer, and all other modern browsers, including Opera, including tablets and smartphones.
I'd like to remove the app. How should I handle the variants it created?
Before uninstall, delete all Special Offers and and click "Synchronise discounted product variants". All BuyXDiscount variants created by the app will be removed.
If you already removed the app, re-install from https://apps.shopify.com/buy-x-get-one and click Synchronize button without any offers created. There is no need to start subscription. When completed, uninstall again.