Simple inventory

Commerce Stock provides a simple, integer field on products as well as rules for enabling or disabling products.

• A rule and action for enabling and disabling the add to cart form.
• A rule and action for validating stock for the add to cart button action.
• A rule for checking the cart form submit, also used for checkout submit and review submit.
• A new checkout pane placed in the first step of checkout: stops the user from accessing checkout if order contains out of stock items
• Supports Decimal stock.
• Works with Inline Entity Form module.
• Advance configuration of the add to cart button action for even more control
• Commerce Stock field formatter for converting stock levels into text messages.

Third party integrations

Here is a brief listing of modules that integrate with ERP systems and report to do stock sync:

• Commerce OpenERP
• Commerce TradeGecko

Using feeds

You can use feeds to modify the fields and with tamper, you may be able to made delta changes.

Back in stock notifications

Commerce Stock Notifications creates a rule action that allows a configured e-mail template to go out when stock is updated.

Matt Tarsi wrote up his approach to handling tracking numbers.