People searching for a betting ID usually get two very different products sold to them under the same name, and the difference matters more than the welcome offer.
A bookmaker ID is a fixed-odds account: you take the price on offer and the house is your counterparty. An exchange ID lets you back and lay against other users, so you can trade out of a position before the match ends. The second is more flexible and considerably less forgiving if you do not understand liability.
Whichever you pick, the test is the same: deposit the minimum, win something small, and withdraw it before you judge the platform. Bonus terms are where the friction hides. A longer checklist for that is at play99.