@Teen You can try deleting it but the script may stop working at some point.
To use no-ip's api you must be accountable for your project.
Look here -->> https://www.no-ip.com/integrate/request
Quote from the api instructions::
Important: Setting the Agent
When making an update it is important that your http request include an HTTP User-Agent to help No-IP identify different clients that access the system. Clients that do not supply a User-Agent risk being blocked from the system.
Your user agent should be in the following format
User-Agent: NameOfUpdateProgram/VersionNumber maintainercontact@domain.com
For example:
User-Agent: Bobs Update Client WindowsXP/1.2 bob@somedomain.com
Thanks for the comment and score Teen :)