I'm creating a Shopify app, I want to send stores an email once they install my app. Where can I access the store's basic information, such as email address?
Is there also a way to be notified when a new store installs/ purchases my app?
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There might be an endpoint for that, I'm not sure. If not, it's probably best to store a flag in your own database. One way is you could store the charge_id provided by the billing API and then run a check on that charge_id each time they enter your app. A lack of a charge_id in your db (if they're a free user and you don't route them through the Billing API) would indicate they're free.