I have made an inventory management button but that was a while ago. Go to the PayPal website and log in to your account. Click "Merchant Services" at the top of the page. Click the type of button you want (Buy Now, Add to Cart, Subscribe). Enter your information to customize the button to your needs. Click "Step 2" to expand the options. Check "Track inventory." In the "Qty. in stock" enter the stock you have available. At the end of Step 2, enter the URL you want to direct your customers to when the item is sold out. Click "Step 3" for additional features. Click "Create Button" when done entering your information. Click "Select Code" to select the button code. Copy and paste the button code into your own web page code.
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