I connected the service for invoicing and receiving payments on my website. Adding it to Tilda turned out to be very simple. I did everything myself, without needing help from programmers. The service works reliably. You can issue invoices and accept payments right after registration. I had to provide a scanned contract, sign it, and take a photo. During registration, there are checks, including a tax ID verification. To automatically generate receipts, you need to connect an online cash register, which is a legal requirement, not just a whim of Yukassa.