This is May from Shopify.
Just to clarify, are you wanting to send an automatic email receipt to your customers after they place an order? If so, this feature is actually included and should be automatically integrated to your Shopify store. After a customer pay for an order, they will get an automated email with an overview of their order. Generally, the email will look like this:
If you go to your 'Settings > Notifications', you can see a list of email notifications you can send out to your customers, and review what each one does. You can also edit your email notification templates there.
Let me know if this helps. If this isn't what you're looking for, please let me know and we can continue with our support.
May | Social Care @ Shopify
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