When creating a bot, I ran into a problem. I want to passing additional parameters to the bot on startup, so deep linking can help me, but all my code uses Update method to get data.
t.me/@SomeBot?start=some_data
How can I get data without using webhook? Or is there any way to use python-telegram-bot methods to get that?
Deep Linking has nothing to do with Webhooks. You can have them even with polling Updates. Here is an example in library.