[Home](./index.md) > [ibm-cloud-sdk-core](./ibm-cloud-sdk-core.md) > [BaseService](./ibm-cloud-sdk-core.baseservice.md) > [(constructor)](./ibm-cloud-sdk-core.baseservice._constructor_.md) ## BaseService.(constructor) Configuration values for a service. **Signature:** ```typescript constructor(userOptions: UserOptions); ``` ## Parameters

Parameter	Type	Description
userOptions	[UserOptions](./ibm-cloud-sdk-core.useroptions.md)	the configuration options to set on the service instance. This should be an object with the following fields: - authenticator: (required) an Object used to authenticate requests to the service. - serviceUrl: (optional) the base url to use when contacting the service. The base url may differ between IBM Cloud regions. - headers: (optional) a set of HTTP headers that should be included with every request sent to the service - disableSslVerification: (optional) a flag that indicates whether verification of the server's SSL certificate should be disabled or not.