Hi,
I would like to create a third party service that customers can sign up for and that vendors can integrate into their POS. The goal is to show the customers who have signed up their orders from whichever vendor has integrated the service.
Is there a way, after checkout, to check if the customer who has made the transaction has signed up for this 3rd party service? Currently my understanding is that this would require the third party to process every transaction to check this.