Instance name
Your CRM instance name is in the URL you use to log into RAYNET CRM:
https://app.raynet.cz/vasefirma/
You can also find it in RAYNET CRM under About the app → the instance name field.
Registration email
The email address you used to generate the API key in RAYNET CRM (under Settings → API keys).
API key
Generate it in RAYNET CRM: Settings → API keys → Generate new key.
Detailed guide: How to generate an API key