Hi Naveen,
Exact steps depend on what flavor of library you would like to use - Java or .Net.
Depending on this, you should register corresponding library and all required dependencies either in Java Bridge or .Net Bridge in TestComplete and then instantiate/access required classes and methods via Java. or dotNET. TestComplete root objects.
https://support.smartbear.com/testcomplete/docs/testing-with/advanced/using-external-functions/calli... and https://support.smartbear.com/testcomplete/docs/testing-with/advanced/using-external-functions/calli... should provide you with more details.
Regards,
/Alex [Community Champion]
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