California Code, Business and Professions Code - BPC § 26068

(a) The department, in consultation with the California Department of Tax and Fee Administration, shall ensure that the track and trace program can also track and trace the amount of the cultivation tax due pursuant to Part 14.5 (commencing with Section 34010) of Division 2 of the Revenue and Taxation Code. The track and trace program shall include an electronic seed to sale software tracking system with data points for the different stages of commercial activity, including, but not limited to, cultivation, harvest, processing, manufacturing, distribution, inventory, sale, and delivery.

(b) The department shall ensure that licensees under this division are allowed to use third-party applications, programs, and information technology systems to comply with the requirements of the expanded track and trace program described in subdivision (a) to report the movement of cannabis and cannabis products throughout the distribution chain and communicate the information to licensing agencies as required by law.

(c) Any software, database, or other information technology system utilized by the department to implement the expanded track and trace program shall support interoperability with third-party cannabis business software applications and allow all licensee-facing system activities to be performed through a secure application programming interface (API) or comparable technology that is well documented, bi-directional, and accessible to any third-party application that has been validated and has appropriate credentials. The API or comparable technology shall have version control and provide adequate notice of updates to third-party applications. The system should provide a test environment for third-party applications to access that mirrors the production environment.