Returns the laddering projections for the billing account, grouped by PS4C product line
(service) and region. Each service group lists one entry per available
gcp-purchases-projection document for that scope (compute scopes are global;
cloud_sql scopes are per-region).
With no filters, returns all existing projection documents in stable order: service groups
ordered compute first, then cloud_sql; within each group, regions sorted with global
first, then remaining regions alphabetically. Services with no projection documents are omitted
(not returned as empty groups). When a filter matches no documents, the response is an
empty items array (not 404). Partial projection documents return only the fields
available in storage.
gcp_service and region filters: omit both to return all available services and
their regions; supply gcp_service alone to return all regions for that service; supply
both to return a single service/region scope. region requires gcp_service — a request
with region but no gcp_service returns 400 with code gcp_service_required. Invalid
gcp_service or region values return 400 with code validation_failed.
404 is returned only when the billing account does not exist or the caller cannot access
it. A billing account that is not onboarded for PS4C still returns 200 with an empty
items array when no projection documents exist — use
GET /ps4commitments/v1/gcp/billing-accounts (or get-by-id) for onboarding status.
Pagination: results are paginated by service group (a whole group is never split
across pages). Groups keep the stable service order above. Use maxResults to limit
page size (default 50, max 500). When more groups remain, the response includes a
non-null pageToken; pass it unchanged on the next request with the same query parameters
(gcp_service, region, maxResults). rowCount is the number of service groups in
this page. An invalid pageToken returns 400 with code pagination_token_invalid; an
expired token returns 400 with code pagination_token_expired.
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