Transition the vendor state
Vendors module
POST/vendors/{id}/transitionsvendors.transition
Moves the vendor lifecycle to another state through its transition RPC, which writes the transition ledger. Uses compare-and-set on `expected_state`; a disallowed transition returns a 422 refusal. Requires `Idempotency-Key`; a replay returns the original response. A rule that refuses the request returns 422 with `refusal` and `reason`.
- Requires the capability vendors.vendor.write.
- OAuth scopes: vendors.
- Send an Idempotency-Key header. A replay with the same key returns the original response.
- Error statuses: 400, 401, 404, 409, 422, 429. Errors are RFC 9457 problem details.
Path and query parameters
| Field | Type | Required | Description |
|---|---|---|---|
| id | string (uuid) | Yes | Identifier of the vendor. |
Request body: VendorTransitionRequest
| Field | Type | Required | Description |
|---|---|---|---|
| expected_state | string | Yes | The state the caller believes the row is in (compare-and-set).Constraints: pattern ^[A-Z][A-Za-z]*( [A-Z][A-Za-z]*)*$ |
| to_state | string | Yes | Target state.Constraints: pattern ^[A-Z][A-Za-z]*( [A-Z][A-Za-z]*)*$ |
| reason | string | No | Reason, required by some transitions.Constraints: length 1 to any |
{
"expected_state": "Prospect",
"to_state": "Onboarded",
"reason": "Client approved the revised scope."
}Response 200: Vendor
| Field | Type | Required | Description |
|---|---|---|---|
| id | string (uuid) | Yes | Identifier of the vendor. |
| org_id | string (uuid) | Yes | Identifier of the owning organization, derived from the parent row and never accepted from the caller. |
| created_at | string (date-time) | Yes | When the row was created. |
| created_by | string (uuid) | null | Yes | Identifier of the person who created the row; null when a seed, platform or system process created it. |
| updated_at | string (date-time) | Yes | When the row was last updated. |
| updated_by | string (uuid) | null | Yes | Identifier of the person who last updated the row; null when a seed, platform or system process updated it. |
| counterparty_type | CounterpartyType | null | Yes | |
| vendor_state | "Prospect" | "Onboarded" | "Active" | "Blocked" | "Canceled" | Yes | Vendor state. |
| counterparty_id | string (uuid) | Yes | Identifier of the counterparty the vendor facet belongs to. |
| payment_terms_days | integer | null | Yes | Days after invoice the vendor is paid.Constraints: range 0 to any |
| default_currency_code | string | null | Yes | ISO 4217 currency the vendor bills in by default.Constraints: pattern ^[A-Z]{3}$ |
| default_account_code | GlAccountCode | null | Yes | |
| default_cost_center_id | string (uuid) | null | Yes | Identifier of the cost center (dimension 1) the vendor's costs post to unless a line says otherwise. |
| bank_account_last4 | string | null | Yes | Last four digits of the vendor's most recent bank account; null when none is on file.Constraints: pattern ^[0-9]{4}$; length 1 to 4 |
{
"id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
"org_id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
"created_at": "2026-10-08T14:30:00Z",
"created_by": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
"updated_at": "2026-10-08T14:30:00Z",
"updated_by": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
"counterparty_type": "AV Integrator",
"vendor_state": "Prospect",
"counterparty_id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
"payment_terms_days": 30,
"default_currency_code": "USD",
"default_account_code": "5400",
"default_cost_center_id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
"bank_account_last4": "4321"
}Code samples
curl -X POST "$XOS_BASE_URL/vendors/0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f/transitions" \
-H "Authorization: Bearer $XOS_API_KEY" \
-H "Idempotency-Key: $(uuidgen)" \
-H "Content-Type: application/json" \
-d '{"expected_state":"Prospect","to_state":"Onboarded","reason":"Client approved the revised scope."}'const { data } = await xos.vendors.transition("0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f", {
"expected_state": "Prospect",
"to_state": "Onboarded",
"reason": "Client approved the revised scope."
});response = xos.vendors.transition("0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f", {"expected_state": "Prospect", "to_state": "Onboarded", "reason": "Client approved the revised scope."})xos vendors transition 0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f --data '{"expected_state":"Prospect","to_state":"Onboarded","reason":"Client approved the revised scope."}'