I have this same issue, Evgene's replies are bullshit, the linked pages only say to use the "tel:" scheme which DOES. NOT. WORK
You currently have to use JavaScript and window.open for both android and iOS.
Thanks, I saw that. I'm asking about programmatically doing this though. Logging into the web interface and manually deleting a notification isn't really helpful when you send upwards of 300K notifications each month.
Ah this is a typo in the question. I've tried this (the question says JSON.parse but should say strngify)
Try closing your developer tools and reloading the pages. Often people have caching disabled within the dev tools and that will ruin everything.
I'll just not worry about this functionality. I don't care that much and getting any real information that isn't in the terrible documentation is like pulling teeth.