Sending pdf (ebook) file after the user successfully subscribe to the website using sendgrid

i am integrating the sendgrid to my wordpress site. the subscription part is done through the plugin of sendgrid and now i want to sent the pdf(ebook) file once the user has successfully verified by the email. once the email of the user is verified a email containing the pdf file should be sent automatically to the verified user.
sorry i am a newbie to programming and i really need it done

Thanks .

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