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Get customer by ID

Retrieve detailed information about a specific customer --- **Related endpoints** - `GET /customers/{customerId}/invoices` — List customer invoices - `GET /customers/{customerId}/subscriptions` — List customer subscriptions - `GET /customers/{customerId}/orders` — List customer orders - `GET /customers/{customerId}/payments` — List customer payments - `PUT /customers/external/batch` — Batch upsert customers by external ID - `POST /customers` — Create a new customer - `GET /customers` — List customers - `PATCH /customers/{id}` — Update customer details **Common errors** - `401 authentication_error` — missing, invalid, expired, or revoked credential. Codes: `authentication_failed`, `invalid_api_key`, `expired_api_key`, `api_key_revoked`, `session_invalid`, `merchant_required`. Carries a `WWW-Authenticate: Bearer` challenge. - `404 resource_missing` — the referenced resource does not exist or is not visible to your key.

GET
/customers/{id}

Retrieve detailed information about a specific customer

Related endpoints

  • GET /customers/{customerId}/invoices — List customer invoices
  • GET /customers/{customerId}/subscriptions — List customer subscriptions
  • GET /customers/{customerId}/orders — List customer orders
  • GET /customers/{customerId}/payments — List customer payments
  • PUT /customers/external/batch — Batch upsert customers by external ID
  • POST /customers — Create a new customer
  • GET /customers — List customers
  • PATCH /customers/{id} — Update customer details

Common errors

  • 401 authentication_error — missing, invalid, expired, or revoked credential. Codes: authentication_failed, invalid_api_key, expired_api_key, api_key_revoked, session_invalid, merchant_required. Carries a WWW-Authenticate: Bearer challenge.
  • 404 resource_missing — the referenced resource does not exist or is not visible to your key.

Authorization

x-api-key<token>

Your RevKeen merchant API key. Create and manage keys in Dashboard → Settings → Developer. Use rk_sandbox_* for staging/test and rk_live_* for production. The same key may be sent as Authorization: Bearer <key> if that suits your HTTP client better. A missing, invalid, expired, or revoked key returns 401 with a WWW-Authenticate: Bearer challenge; a valid key without the required scope returns 403.

In: header

Path Parameters

id*string

Customer UUID

Formatuuid

Response Body

application/json

application/json

application/json

application/json

Stuck on an error response? Ask the RevKeen assistant to explain it.
curl "https://api.revkeen.com/v2/customers/00000000-0000-0000-0000-000000000000" \
  -H "x-api-key: $REVKEEN_API_KEY"
{  "data": {    "id": "497f6eca-6276-4993-bfeb-53cbbbba6f08",    "merchant_id": "500924a8-3f5e-4c00-beb8-2efcde988aea",    "merchant_ref_id": "string",    "email": "user@example.com",    "name": "string",    "phone": "string",    "company_name": "string",    "address_line1": "string",    "address_line2": "string",    "city": "string",    "state": "string",    "postal_code": "string",    "country": "string",    "auth_user_id": "990d439e-9996-4264-8929-f50029888dd9",    "metadata": {},    "custom_fields": {},    "created_at": "2019-08-24T14:15:22Z",    "updated_at": "2019-08-24T14:15:22Z"  }}

Upsert customer by external ID PUT

Create or update a customer identified by external source and ID. Used by integrations (PracticeHub, Wodify) to sync customers. --- **Related endpoints** - `GET /customers/{customerId}/invoices` — List customer invoices - `GET /customers/{customerId}/subscriptions` — List customer subscriptions - `GET /customers/{customerId}/orders` — List customer orders - `GET /customers/{customerId}/payments` — List customer payments - `PUT /customers/external/batch` — Batch upsert customers by external ID - `POST /customers` — Create a new customer - `GET /customers` — List customers - `GET /customers/{id}` — Get customer by ID **Common errors** - `400 invalid_request` — malformed payload or failed validation. - `401 authentication_error` — missing, invalid, expired, or revoked credential. Codes: `authentication_failed`, `invalid_api_key`, `expired_api_key`, `api_key_revoked`, `session_invalid`, `merchant_required`. Carries a `WWW-Authenticate: Bearer` challenge. **Idempotency** Pass an `Idempotency-Key` header (UUID v4 recommended) to make retries safe. Keys are valid for 24 hours; see [the idempotency guide](/docs/fundamentals/idempotency).

List customer invoices GET

Retrieve all invoices for a specific customer --- **Related endpoints** - `GET /customers/{customerId}/subscriptions` — List customer subscriptions - `GET /customers/{customerId}/orders` — List customer orders - `GET /customers/{customerId}/payments` — List customer payments - `PUT /customers/external/batch` — Batch upsert customers by external ID - `POST /customers` — Create a new customer - `GET /customers` — List customers - `GET /customers/{id}` — Get customer by ID - `PATCH /customers/{id}` — Update customer details **Common errors** - `401 authentication_error` — missing, invalid, expired, or revoked credential. Codes: `authentication_failed`, `invalid_api_key`, `expired_api_key`, `api_key_revoked`, `session_invalid`, `merchant_required`. Carries a `WWW-Authenticate: Bearer` challenge. - `404 resource_missing` — the referenced resource does not exist or is not visible to your key. **Pagination** Offset-based with `limit` (default 25, max 100) and `offset`. The response `pagination` block includes `total` and `hasMore`. See [the pagination guide](/docs/fundamentals/pagination) for SDK auto-paging helpers.