Usage
Select Custom HTML block in editor and insert the following snippet with your-token replaced by the token configured in https://admin.bilesuparadize.lv and your-desired-event-id replaced with event identifier:
<section><template shadowrootmode="open"><style>div,iframe{width:100%}div{position:relative;aspect-ratio:1/1}@media (min-aspect-ratio:10/19),@supports not (aspect-ratio:1/1){div{height:0;padding-top:100%}}@media (min-aspect-ratio:1/1){div{max-height:500px;height:100%;padding-top:0}}@media (max-aspect-ratio:10/19){div{aspect-ratio:9/16}}iframe{position:absolute;top:0;left:0;height:100%;border:none}</style><div><iframe src="https://www.bilesuparadize.lv/v1.0/embed/your-token/event/your-desired-event-id/buy-tickets"> allow="payment"</iframe></div></template></section>