Engaging with new customers is a must if you plan on building a long-term relationship with them. The Post Purchase flow allows you to just that. It should not be confused with an Order Confirmation message (that is sent separately by your eCommerce platform) but is instead an opportunity to begin sharing brand and product information, providing helpful tips or FAQs, and to eventually upsell and cross-sell the customer on other products in your store.
A popup or a custom field added to an existing popup, to capture SMS subscribers. To be most effective, popups should offer visitors an incentive for signing up. SMS subscribers are automatically added to a list when they opt-in. Typically a popup is paired with a flow that fulfills whatever incentive was offered in the popup.