Provisioning API

Create a user

POST

/users

const url = 'https://live-api.customers.ac/v1/users';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: '{"email":"jane@acme.com","company":"Acme Corp","name":"Jane Doe","external_id":"cust_8hTk2mN"}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}

curl --request POST \
  --url https://live-api.customers.ac/v1/users \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{ "email": "jane@acme.com", "company": "Acme Corp", "name": "Jane Doe", "external_id": "cust_8hTk2mN" }'

Creates a new end customer. The external_id field is optional and can be used to store your platform’s internal identifier for this customer.

Authorizations

BearerAuth
users:write

Request Body^required

application/json

object

email

required

The user’s email address. Must be unique across your partner account.

string format: email

name

The user’s full name.

string

company

The user’s company or organization name.

string

external_id

An optional identifier from your system.

string

<= 255 characters

Example

{
  "email": "jane@acme.com",
  "company": "Acme Corp",
  "name": "Jane Doe",
  "external_id": "cust_8hTk2mN"
}

Responses

201

User created.

application/json

object

data

required

object

required

Unique identifier for the user.

string format: uuid

email

required

The user’s email address. Must be unique across your partner account.

string format: email

name

The user’s full name.

string | null

company

The user’s company or organization name.

string | null

external_id

An optional identifier from your system. Useful for correlating sending.ac users with your own customer records.

string | null

senders_count

Number of senders belonging to this user.

integer

created_at

required

When the user was created.

string format: date-time

updated_at

required

When the user was last updated.

string format: date-time

Example

{
  "data": {
    "id": "usr_a1b2c3d4-e5f6-7890-abcd-ef1234567890",
    "email": "jane@acme.com",
    "name": "Jane Doe",
    "company": "Acme Corp",
    "external_id": "cust_8hTk2mN",
    "senders_count": 2,
    "created_at": "2026-03-20T09:00:00Z",
    "updated_at": "2026-03-20T09:00:00Z"
  }
}

400

The request body failed validation.

application/json

object

error

required

object

code

required

A machine-readable error code.

string

Allowed values: auth.missing_key auth.invalid_key auth.insufficient_scope rate.quota_exceeded validation.required_field validation.invalid_value resource.not_found resource.already_exists resource.not_ready server.error

message

required

A human-readable explanation of the error.

string

doc_url

A link to the documentation page for this error code.

string format: uri

details

For validation errors, a list of individual field-level problems.

Array<object> | null

object

field

required

The field that caused the error, in dot notation.

string

code

A machine-readable code for this specific validation issue.

string

message

required

A human-readable explanation.

string

Example

{
  "error": {
    "code": "validation.required_field",
    "message": "The request body is missing required fields.",
    "doc_url": "https://docs.sending.ac/errors/validation-required-field",
    "details": [
      {
        "field": "email",
        "code": "validation.required_field",
        "message": "This field is required."
      }
    ]
  }
}

401

Authentication failed. The API key is missing or invalid.

application/json

object

error

required

object

code

required

A machine-readable error code.

string

message

required

A human-readable explanation of the error.

string

doc_url

A link to the documentation page for this error code.

string format: uri

details

For validation errors, a list of individual field-level problems.

Array<object> | null

object

field

required

The field that caused the error, in dot notation.

string

code

A machine-readable code for this specific validation issue.

string

message

required

A human-readable explanation.

string

Examples

No API key provided

{
  "error": {
    "code": "auth.missing_key",
    "message": "No API key was provided. Include your key in the Authorization header: Bearer sac_live_xxxxx.",
    "doc_url": "https://docs.sending.ac/errors/auth-missing-key"
  }
}

Invalid API key

{
  "error": {
    "code": "auth.invalid_key",
    "message": "The API key provided is invalid or has been revoked.",
    "doc_url": "https://docs.sending.ac/errors/auth-invalid-key"
  }
}

403

The API key does not have the required scope for this operation.

application/json

object

error

required

object

code

required

A machine-readable error code.

string

message

required

A human-readable explanation of the error.

string

doc_url

A link to the documentation page for this error code.

string format: uri

details

For validation errors, a list of individual field-level problems.

Array<object> | null

object

field

required

The field that caused the error, in dot notation.

string

code

A machine-readable code for this specific validation issue.

string

message

required

A human-readable explanation.

string

Example

{
  "error": {
    "code": "auth.insufficient_scope",
    "message": "Your API key does not have the 'senders:write' scope required for this operation.",
    "doc_url": "https://docs.sending.ac/errors/auth-insufficient-scope"
  }
}

409

The resource already exists.

application/json

object

error

required

object

code

required

A machine-readable error code.

string

message

required

A human-readable explanation of the error.

string

doc_url

A link to the documentation page for this error code.

string format: uri

details

For validation errors, a list of individual field-level problems.

Array<object> | null

object

field

required

The field that caused the error, in dot notation.

string

code

A machine-readable code for this specific validation issue.

string

message

required

A human-readable explanation.

string

Example

{
  "error": {
    "code": "resource.already_exists",
    "message": "A user with email jane@acme.com already exists.",
    "doc_url": "https://docs.sending.ac/errors/resource-already-exists"
  }
}

429

You have exceeded the rate limit. Wait and retry.

application/json

object

error

required

object

code

required

A machine-readable error code.

string

message

required

A human-readable explanation of the error.

string

doc_url

A link to the documentation page for this error code.

string format: uri

details

For validation errors, a list of individual field-level problems.

Array<object> | null

object

field

required

The field that caused the error, in dot notation.

string

code

A machine-readable code for this specific validation issue.

string

message

required

A human-readable explanation.

string

Example

{
  "error": {
    "code": "rate.quota_exceeded",
    "message": "Rate limit exceeded. You may make 120 requests per minute. Retry after 30 seconds.",
    "doc_url": "https://docs.sending.ac/errors/rate-quota-exceeded"
  }
}

Headers

Retry-After

integer

Example

Number of seconds to wait before retrying.

X-RateLimit-Limit

integer

Example

The maximum number of requests allowed per minute.

X-RateLimit-Remaining

integer

Example

The number of requests remaining in the current window.

X-RateLimit-Reset

integer

Example

1711267260

Unix timestamp when the rate limit window resets.

Create a user

Authorizations

Request Bodyrequired

Example

Responses

201

Example

400

Example

401

Examples

403

Example

409

Example

429

Example

Headers

Example

Example

Example

Example

Request Body^required