You are on the Get more reviews screen of your Business Profile, and Google is offering a review link and a QR code for it. Google's help page says to copy the link with the Copy button, and to save the code by right-clicking it and choosing Save image as.... The same page says review QR codes can only be generated on a computer browser, not on mobile devices, and it lists no logo, colour or size options. Copy the link and bring it here.
What you get here. The review link goes into the code unchanged. Around it you choose the pattern and one of four colour sets, add your logo to the centre, and download an SVG that scales to any size or a 1200px PNG. When you add a logo, error correction goes up to Q automatically, so the code can lose the area under the logo and still scan. The generator runs in your browser, so once you have the link, you can finish the code on a phone.
Where Google suggests using it. Google's page lists receipts, thank-you emails, the end of a chat, and a printed code displayed in your store. Each printed spot needs a different size. In the sizing panel, the 20mm Business card preset suits something held in the hand, like a receipt. Table tent, at 40mm, suits a counter. Poster, at 120mm, suits a window read from about 1.2m away. The panel works out the grid and the size of each square for your link, and warns you if a square drops under 0.4mm.
No discounts for reviews. The same Google page says offering incentives, like free or discounted goods or services, in exchange for reviews counts as fake engagement and is strictly prohibited. That rules out a sign offering money off for a review. Put a plain request beside the code instead, asking customers to leave one.
Tracking and UTM tags. The code points straight at Google. That makes it a static code: the scan happens between the customer's phone and Google, no generator can count it, and a notice under the generator says as much once the link is in. UTM tags don't help on a Google link either, because they are read by analytics on your own site. Save them for codes that lead to your own pages, built with the QR code UTM builder. To count scans of the review code, it has to pass through a redirect you control, which is what a Raydar link is. The trade-offs are set out in how to track QR code scans.
Before you print. The Square pattern is the safer choice for a card that sits on a counter for months. Check contrast and finish against QR code best practices for print. Then open the PNG in the QR code reader and compare the link inside with the one Google gave you.