Can i integrate web sdk angular with free account

Please let me know can i use websdk in angular with free account?
My Client is saying that when demo will complete then they will take business account.
I have tried with my free account with web sdk sample but getting signature expired error please let me know.

Hi @speaktoniraj89, the Web SDK can be used in any project on a free account during the Free Trial. After that, we suggest a Pro account to use the Web SDK after your initial testing.

A signature should be generated on each request to join the SDK, this should not be stored and reused.