When a customer completes a purchase through the checkout, and confirms they wish to receive marketing emails by checking the box, consent to receive is confirmed by the purchaser, so an opt-in confirmation email WILL NOT be sent.

If you process a customer's order through the Shopify POS app and the customer consent box is checked, the customer will be sent a opt-in confirmation email.

If you use the Shopify subscription form on your website, the customer will be sent a opt-in confirmation email.

For all of the above, the customer will be subscribed to the list "Accepted Marketing" - this cannot be changed.

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