The cookbook is available here: https://github.com/hl7-be/referral/tree/master/cookbooks. Warning: this is the cookbook for the early adopters of the JUNE 2023 release. Final releases of the FHIR profiles and the Cookbook will be available from the eHealth and RIZIV/INAMI sites.
Referral prescription ImplementationGuide
This is a draft publication by the HL7 Belgium Referral prescription work group. http://build.fhir.org/ig/hl7-be/referral
Project KanBan at: https://github.com/hl7-be/referral/projects/1
current state of affairs can be seen at: http://build.fhir.org/ig/hl7-be/referral
Not to be used for any other purpose.