Hello,
the api is not working anymore for me. I did not changed the request in my app but now I get the error:
QR code is not readable with such params. Current logo_size: 0.22. Try to reduce logo_size param (0.2-0.3 values are usually a good start) and make sure color contrast is good. If you still want to see this QR code, specify validate=0 in params

It happens when you select svg as a format with an own image.