Skip to main content
Solved

Sending messages to Facebook leads

  • April 9, 2026
  • 2 comments
  • 18 views

josip856

Hi,

I noticed that sometimes Manychat API for Facebook straight up doesn’t work for some leads

 

This is an example:
 

This is what I send through API

And this lead does exist on the Manychat (same ID)

But i still get “Subscriber does not exist” error

Best answer by Gustavo Boregio

Hey ​@josip856 

First, check the formatting that you have. For example, the “type”: "facebook" that you have there is not in the API docs. Here's the link to the API docs:
https://manychat.github.io/dynamic_block_docs/

Next: Sometimes Manychat has issues with very long subscriber IDs. Instead of sending it as an integer, try sending it as a string by adding quotation marks and see if that works.

If that still fails, make sure you are sending this message within 24 hours of the subscriber. If you are not, the message will not send.

And if all else fails and you have done all the checks, talk to support so they can take a look at your specific case and see what's going on.

2 replies

Gustavo Boregio
Forum|alt.badge.img+7
  • Community Moderator & Expert
  • Answer
  • April 9, 2026

Hey ​@josip856 

First, check the formatting that you have. For example, the “type”: "facebook" that you have there is not in the API docs. Here's the link to the API docs:
https://manychat.github.io/dynamic_block_docs/

Next: Sometimes Manychat has issues with very long subscriber IDs. Instead of sending it as an integer, try sending it as a string by adding quotation marks and see if that works.

If that still fails, make sure you are sending this message within 24 hours of the subscriber. If you are not, the message will not send.

And if all else fails and you have done all the checks, talk to support so they can take a look at your specific case and see what's going on.


josip856
  • Author
  • Chat Surfer
  • April 10, 2026

Hey ​@josip856 

First, check the formatting that you have. For example, the “type”: "facebook" that you have there is not in the API docs. Here's the link to the API docs:
https://manychat.github.io/dynamic_block_docs/

Next: Sometimes Manychat has issues with very long subscriber IDs. Instead of sending it as an integer, try sending it as a string by adding quotation marks and see if that works.

If that still fails, make sure you are sending this message within 24 hours of the subscriber. If you are not, the message will not send.

And if all else fails and you have done all the checks, talk to support so they can take a look at your specific case and see what's going on.

Hi Gustavo, yes, that “type”:”facebook” is not in the official docs for the API, but the doc are very bad overall and that works. Issue turned out to be the long IDs as you said, so yeah, sending them as strings works