The answer to your question, Yes, you can!

This is one of the new features that we have built to make it easier for you to collect your payment from your attendees.

To send the payment link to those who registered using Pay Later, you can follow these steps:

1. Create your email template under design. 

If you not sure how to do it, you can refer this article: How to edit/add email template

2. When creating your email template, go to Insert Tag

3. From the list, you can choose Pay Later Link. 
The system will use the tag to create an unique payment link for each participant when you send out the email using Promotion module

4. Lastly, click Save.
To send the email, you can go to Promotion module. You may also refer to this article: Would I be able to send email blast?