Is the Connect for Web Services API enabled by default on my site?
Connect Web Services for SOAP (CWS) API, All Versions
The Connect Web Services for SOAP (CWS) API is enabled by default on all sites. In order to confirm that these features are enabled, please a service request via Ask Technical Support.
Further, the SEC_PAPI_INTEG_HOSTS_SOAP configuration is specific to each interface and can be used to control access to the API by IP address, but the default is to allow all IPs to make requests.
For information on troubleshooting connection problems with the API, refer to Answer ID 6756: Access Denied with SOAP API.