Client Version {#uc_cc_client_version}
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This field is used to specify the `Unified Checkout`API version that your integration should use.  
`Visa Acceptance Solutions` recommends that you do no include this field in your `uc/v1/sessions` API request. When you do not include this field, `Unified Checkout` automatically uses the latest available version. This ensures access to the most recent enhancements and updates without requiring integration changes.  
When you include this field, the value must be provided in `MAJOR.MINOR` format (for example, `1.1` or `1.2`). For information about semantic versioning, see [Versioning](/docs/vas/en-us/unified-checkout/developer/all/rest/unified-checkout/uc-getting-started-ss-setup/uc-versioning.md "").

> IMPORTANT
> This field cannot be configured through the merchant experience screens in the ` Business Center `.