While using the Service Cloud API, the following error occurs.

Things that need to be checked to resolve the issue are:
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On your LeadSquared account, navigate to My Profile > Settings > Service Cloud, and click API Configurations.
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Alongside Enable API, enable the slider LeadSquared Service CRM APIs.
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Alongside Enable IP Whitelisting, enable the slider and add the IPs you want to whitelist. This step is optional.
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Once you’re done, click Save.
