Add link to ECA guide in README
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3479488. --> Reported by: [ksandr](https://www.drupal.org/user/3676187) Related to !19 >>> <p>Hi! How can I send a separate email for each item in a paid order, where the email contains the details of the order item and the customer information?</p>
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