There are two options in sending out messages manually.
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First you would need to determine if you are wanting to use the Amazon request review button manually or send a custom email message to the buyer.
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If you wish to use the Amazon request review button (the message is already created and not editable) manually please refer to this article.
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If you wish to use the custom email option then please ensure you have already created a template to send out manually by referring to this article.