Pinterest has asked a number of ecommerce platforms to shift their focus from supporting Buyable Pins to supporting Pinterest Product Pins instead. This, unfortunately, includes Magento. We recommend our Rich Product Pins extension if you want to enrich your products on Pinterest. Rich Product Pins do not require an approval process and are simple to install/configure in your Magento store. Rich Product Pins highlight your product price, availability and other product data on Pinterest pins, and then direct shoppers to buy via your store like normal. To learn more and buy this extension, please see the Magento 1 Extension page, or the Magento 2 Extension Page.