With the upcoming version POST /projects (project-creation) requires an organization id.
Given in body like always, for example:
"organization": {
"id": "97369a05-911e-4dbb-bfa8-c47820d809a4"
},
This belongs to the change, that every project MUST belong to an organization.
The endpoints POST /organizations/:organizationId/projects and DELETE /organizations/:organizationId/projects/:relId are removed for obvious reasons.