Customer ID

hey there guys I'm creating a new chat bot for shopify it'll help out with customer service, marketing and remarketing. I need your help with me API call. I'm using a link to get in touch with the customer through FB messenger and I've got this link for my API call:

Example​ ​link: https:\\\Paneco?ref=ns1234 

Explanation: https:\\\​ ​- Messenger​ ​host

Paneco​ ​- Your​ ​Facebook​ ​page​ ​username​ ​or​ ​ID.

ns​ ​- NewSale

1234​ ​- BuyerID 
just that...I can't get the buyerID in shopify, can someone tell me how do I call it / use it?

Chen Zissu
Expert Profile:
Skype: @zissuc