#DIY a zigbee smart switch
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You're expected to become a CSA member to get access to everything needed to develop devices (and get them certified). https://csa-iot.org/become-member/#Membership "Adopter" level would probably be appropriate.
(note that Matter is under the same organization, if you're interested in doing Matter over Thread)
That said, most of the specifications are available at no charge: https://csa-iot.org/developer-resource/specifications-download-request/