The reference design cannot be bought since it is not being manufactured by us.
You can download the hardware design files given on the website to fabricate your own boards. In order to customize the power profiles, you can use the EZ-PD Configuration Utility to update the configuration table. You can also use the SDK version (attached) of its firmware released for further customization.
Have any SDK guide or FW API document for CYPD2134-24LQXI_PA_NCP82139 ?
You can refer to the documentation provided for CCG2 in the CCGx SDK. The SDK and API Guide will remain the same.