No you won't need to uninstall and re-install the app if a change or update is made to your store theme.
no, there's no limit to the number of subscribers you transfer from Shopify to Mailchimp. Our service operates as a bridge between the two, keeping information in sync.
If you’ve recently added or updated your merge tags in Mailchimp, refresh the ShopSync app page to see the changes.
ShopSync uses the Mailchimp API to instantly push e-commerce data and customers to Mailchimp lists. As a customer visits your site, once they are opt-in to the newsletter they'll end up in Mailchimp in real-time. If double opt-in is enabled, the customer will have to accept the opt-in before they are added.
If you'd like to use the ShopSync app with another store you may disconnect and reconnect anytime. Simply go to your Shopify apps page and uninstall, then connect ShopSync to the store of your choice.
If you'd like to use the ShopSync app with another list you may disconnect and reconnect anytime. Just go to your Shopify app settings and click the disconnect button at the top. Once disconnected, please re-authenticate with Mailchimp and initiate the sync process again.
Promo codes are not synced in real-time from Shopify to Mailchimp. Typically, these populate every few hours. However, if you're not seeing them right away, you can click the "Refresh" button on the app page that will fetch the latest codes available in your store.