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Create or upsert a customer

POST
/v1/customers

With external_id the write is an upsert with merge: 201 when the customer is created, 200 when an existing one is updated.

Authorizations

Section titled “Authorizations ”

Parameters

Section titled “ Parameters ”

Header Parameters

Section titled “Header Parameters ”
Bookrail-Version

The dated API version to speak. Defaults to 2026-09-01; an unsupported value is a 400.

string
Example
2026-09-01
Bookrail-Actor

Which Bookrail tool the caller is, recorded as actor.via on every event the request writes. A closed list: an unknown value is a 400. Absent means the request declared no tool.

string
Allowed values: mcp cli sdk dashboard
Idempotency-Key

Retry-safety key, 1 to 255 characters. The same key within 24 hours replays the first response, errors included, and never produces a second effect.

string
>= 1 characters <= 255 characters

Request Body required

Section titled “Request Body required ”
object
external_id
string | null
>= 1 characters <= 200 characters
email
string | null format: email
<= 320 characters
phone
string | null
>= 3 characters <= 50 characters
name
string | null
>= 1 characters <= 200 characters
timezone

IANA time zone name.

string
Example
Europe/Rome
locale
string | null
>= 2 characters <= 20 characters
tenant_id
string | null
>= 1 characters <= 200 characters
metadata

Free-form key/value pairs stored with the object and returned untouched.

object
key
additional properties

Responses

Section titled “ Responses ”

200

Section titled “200 ”

Success.

object
id
required

Identifier of a customer, prefixed with cus_.

string
/^cus_[0-9a-f]{32}$/
Example
cus_0198f0c2a1b47e2e9a1c0f4d5e6a7b8c
object
required
string
Allowed values: customer
external_id
required
string | null
email
required
string | null
phone
required
string | null
name
required
string | null
timezone
required
string | null
locale
required
string | null
tenant_id
required

Optional tenant this object belongs to, for multi-tenant customers.

string | null
metadata
required

Free-form key/value pairs stored with the object and returned untouched.

object
key
additional properties
environment
required

The environment of the API key that created the object.

string
Allowed values: test live
created_at
required

ISO 8601 instant in UTC.

string | null format: date-time
Example
2026-09-08T07:00:00Z
updated_at
required

ISO 8601 instant in UTC.

string | null format: date-time
Example
2026-09-08T07:00:00Z

Headers

Section titled “Headers ”
Bookrail-Request-Id
required

Identifier of this request. Quote it to support.

string
Bookrail-Version
required

The API version this response was produced with.

string
Idempotent-Replayed

true when the body is the stored answer of an earlier request with the same Idempotency-Key.

string

201

Section titled “201 ”

Created.

object
id
required

Identifier of a customer, prefixed with cus_.

string
/^cus_[0-9a-f]{32}$/
Example
cus_0198f0c2a1b47e2e9a1c0f4d5e6a7b8c
object
required
string
Allowed values: customer
external_id
required
string | null
email
required
string | null
phone
required
string | null
name
required
string | null
timezone
required
string | null
locale
required
string | null
tenant_id
required

Optional tenant this object belongs to, for multi-tenant customers.

string | null
metadata
required

Free-form key/value pairs stored with the object and returned untouched.

object
key
additional properties
environment
required

The environment of the API key that created the object.

string
Allowed values: test live
created_at
required

ISO 8601 instant in UTC.

string | null format: date-time
Example
2026-09-08T07:00:00Z
updated_at
required

ISO 8601 instant in UTC.

string | null format: date-time
Example
2026-09-08T07:00:00Z

Headers

Section titled “Headers ”
Bookrail-Request-Id
required

Identifier of this request. Quote it to support.

string
Bookrail-Version
required

The API version this response was produced with.

string
Idempotent-Replayed

true when the body is the stored answer of an earlier request with the same Idempotency-Key.

string

400

Section titled “400 ”

Error codes: idempotency_key_reused, invalid_body, parameter_invalid, parameter_missing, unsupported_api_version.

object
error
required
object
type
required
string
Allowed values: invalid_request authentication permission not_found conflict rate_limit policy_violation payment_required internal
code
required

Machine readable code. The set is per operation; each response below lists the ones it can produce.

string
message
required
string
param

The field or header the error is about, when there is one.

string
doc_url
required
string
request_id
required
string

Headers

Section titled “Headers ”
Bookrail-Request-Id
required

Identifier of this request. Quote it to support.

string
Bookrail-Version
required

The API version this response was produced with.

string

401

Section titled “401 ”

Error codes: invalid_api_key, invalid_authorization_header, missing_api_key, revoked_api_key.

object
error
required
object
type
required
string
Allowed values: invalid_request authentication permission not_found conflict rate_limit policy_violation payment_required internal
code
required

Machine readable code. The set is per operation; each response below lists the ones it can produce.

string
message
required
string
param

The field or header the error is about, when there is one.

string
doc_url
required
string
request_id
required
string

Headers

Section titled “Headers ”
Bookrail-Request-Id
required

Identifier of this request. Quote it to support.

string
Bookrail-Version
required

The API version this response was produced with.

string

409

Section titled “409 ”

Error codes: idempotency_key_in_progress.

object
error
required
object
type
required
string
Allowed values: invalid_request authentication permission not_found conflict rate_limit policy_violation payment_required internal
code
required

Machine readable code. The set is per operation; each response below lists the ones it can produce.

string
message
required
string
param

The field or header the error is about, when there is one.

string
doc_url
required
string
request_id
required
string

Headers

Section titled “Headers ”
Bookrail-Request-Id
required

Identifier of this request. Quote it to support.

string
Bookrail-Version
required

The API version this response was produced with.

string

500

Section titled “500 ”

Error codes: internal_error.

object
error
required
object
type
required
string
Allowed values: invalid_request authentication permission not_found conflict rate_limit policy_violation payment_required internal
code
required

Machine readable code. The set is per operation; each response below lists the ones it can produce.

string
message
required
string
param

The field or header the error is about, when there is one.

string
doc_url
required
string
request_id
required
string

Headers

Section titled “Headers ”
Bookrail-Request-Id
required

Identifier of this request. Quote it to support.

string
Bookrail-Version
required

The API version this response was produced with.

string