Hi,
How do I set timeline messages and tags using liquid code. For example I have a quiz in jotform. When user complete the quiz he/she is redirected back to my shopify page. On successful completion I want to set quiz-complete tag and show a timeline message on admin. How do I do this. Thanks in advance.
#1 There is no timeline api, at minimum apps can create things like order notes that will show on timelines.
https://community.shopify.com/post/205764
#2 The online channels liquid templating system does not interact with the admin api in this way as that would be a serious security issue and mixing of concerns.
You must build your own solution or app to do something like this that liquid cannot do.
Such as seeing if a service like zapier or integromat integrates with both jotform and shopify to update a customers or products tags. There’s also shopify apps such as usemechanic though could possibly be scripted to make a solution.