The license number should open in the CGA register. The company and domain on the certificate should match the site you are on. A mirror with a different domain is a separate check, not the same certificate by default.
Read the bonus by wagering and cashout cap, not by the percentage on the banner. The first withdrawal will likely ask for documents. Passing KYC early is calmer than doing it after a win.
Discussion
I checked the number in the register before the deposit. It opened, company matched. That was enough for me to try a small amount.
The bonus looked big until I opened the cap. The cap mattered more than the percent.