Are You Still Allowed To Use ManyChat To Message Customers?

I was wanting to create a ManyChat account and add a QR link to my product insert in order to more easily communicate with my customers regarding issues, questions, winning surprise gifts, and for them to learn of my future Amazon product launches. I have not seen any recent tutorial on this and was wondering if we are still allowed to do this, or is it now against Amazon’s TOS.

What other methods of communications are you guys using to communicate with customers? I was wanting to also add my company email address and social media pages for DMs.

Any help would be greatly appreciated!