# List the custom fields of a company API Reference Returns the invoice custom fields of this company, each one with the options that apply to the query, ordered by `key`. A field with `suggest_values: false` carries no options. - **Options per customer:** with `customer_id`, each field carries the common options and those of that customer, which is what an invoice for that customer can offer. Without it, only the common options. To page through every option of a field, use `GET /v1/companies/{company_id}/custom-fields/{key}/options`. - **Archived:** archived fields and options are left out unless `include_archived=true`. **Closed catalogue.** A company defines a small set of fields: this collection carries no `pagination`, takes no `page`/`limit`, and every response holds the whole set. ## GET /v1/companies/{company_id}/custom-fields **List the custom fields of a company** Returns the invoice custom fields of this company, each one with the options that apply to the query, ordered by `key`. A field with `suggest_values: false` carries no options. - **Options per customer:** with `customer_id`, each field carries the common options and those of that customer, which is what an invoice for that customer can offer. Without it, only the common options. To page through every option of a field, use `GET /v1/companies/{company_id}/custom-fields/{key}/options`. - **Archived:** archived fields and options are left out unless `include_archived=true`. **Closed catalogue.** A company defines a small set of fields: this collection carries no `pagination`, takes no `page`/`limit`, and every response holds the whole set. ### Authentication Accepts any of: - `ApiKeyAuth` (HTTP bearer, token format `beel_sk_*`) ### Parameters - **company_id** (required) in path `string`: Unique identifier (UUID) of the company the operation acts on — its identifier, not its NIF. It is the only source of context: the account that owns it is derived from it, and the `BeeL-Active-Company` header plays no part. A company you do not reach answers `403`, and so does a company that does not exist, so the existence of a company in another account is never disclosed. - **customer_id** (optional) in query `string`: Adds the options of this customer to the common ones. A value that names no customer of this company is not an error: only the common options come back. - **include_archived** (optional) in query `boolean` (default: false): Include archived fields and archived options. ### Responses #### 200: Custom fields of the company. **Content `application/json`:** - **success** (required) `boolean`: No description (example: true) - **data** (required): The payload. An object for a single resource; an object holding the named collection (and its `pagination`) for a listing. Never a bare array at this level in v1. - **meta** `ResponseMeta` - **data** `object`: No description - **custom_fields** (required) `array[CustomField]`: No description #### 400: The request target could not be read as declared, so nothing was looked up. Three causes, all named in `error.details`: a path or query parameter whose value does not parse as its type (`VALIDATION_ERROR` — a UUID that is not a UUID, an unknown enum value, an empty element in a list such as `status=ISSUED,`), a required parameter that was not sent (`MISSING_PARAMETER`), or a header that is meant to carry an identifier and does not (`ACTIVE_COMPANY_HEADER_INVALID`). A list parameter sent entirely empty (`status=`) is not an error: it is the same as omitting it. The fault is in the target, not in the content — which is what `422` is defined over. **Content `application/json`:** - **success** (required) `boolean`: No description (example: false) - **error** (required) `ErrorDetail` - **meta** `ResponseMeta` - **type** `string` (uri): Stable URI that identifies the problem type and where the integrator will find its documentation. (example: "https://docs.beel.es/errors/INVOICE_NO_LINES") - **title** `string`: Short summary of the problem type. Stable between occurrences of the same `type`. (example: "INVOICE_NO_LINES") - **detail** `string`: Specific message for this occurrence, localized according to `Accept-Language` (`es`, `en`, `ca`); defaults to English. Matches the legacy `error.message`. (example: "The invoice must have at least one line") - **instance** `string` (uri-reference): URI that identifies the specific occurrence of the problem — typically the path of the affected resource. (example: "/v1/invoices/abc-123") **Example:** ```json { "success": false, "error": { "code": "VALIDATION_ERROR", "message": "The parameter 'invoice_id' has an invalid type. Expected: UUID.", "details": { "field": "invoice_id", "invalid_value": "deliveries", "expected_format": "UUID" } }, "meta": { "timestamp": "2025-01-15T10:30:00Z", "request_id": "4bf92f3577b34da6a3ce929d0e0e4736" } } ``` #### 401: Missing or invalid authentication. Like every other error, `message`/`detail` is localized according to `Accept-Language` (`es`, `en`, `ca`); defaults to English when the header is missing or asks for none of those. **Content `application/json`:** - **success** (required) `boolean`: No description (example: false) - **error** (required) `ErrorDetail` - **meta** `ResponseMeta` - **type** `string` (uri): Stable URI that identifies the problem type and where the integrator will find its documentation. (example: "https://docs.beel.es/errors/INVOICE_NO_LINES") - **title** `string`: Short summary of the problem type. Stable between occurrences of the same `type`. (example: "INVOICE_NO_LINES") - **detail** `string`: Specific message for this occurrence, localized according to `Accept-Language` (`es`, `en`, `ca`); defaults to English. Matches the legacy `error.message`. (example: "The invoice must have at least one line") - **instance** `string` (uri-reference): URI that identifies the specific occurrence of the problem — typically the path of the affected resource. (example: "/v1/invoices/abc-123") **Example:** ```json { "success": false, "error": { "code": "UNAUTHORIZED", "message": "Authentication is required to access this resource" }, "meta": { "timestamp": "2025-01-15T10:30:00Z", "request_id": "4bf92f3577b34da6a3ce929d0e0e4736" } } ``` #### 403: Your account does not own or manage this company, or does not hold the required access over it. A company that does not exist answers the same way. That case answers `error.code` `ACTIVE_COMPANY_NOT_ACCESSIBLE`. **Content `application/json`:** - **success** (required) `boolean`: No description (example: false) - **error** (required) `ErrorDetail` - **meta** `ResponseMeta` - **type** `string` (uri): Stable URI that identifies the problem type and where the integrator will find its documentation. (example: "https://docs.beel.es/errors/INVOICE_NO_LINES") - **title** `string`: Short summary of the problem type. Stable between occurrences of the same `type`. (example: "INVOICE_NO_LINES") - **detail** `string`: Specific message for this occurrence, localized according to `Accept-Language` (`es`, `en`, `ca`); defaults to English. Matches the legacy `error.message`. (example: "The invoice must have at least one line") - **instance** `string` (uri-reference): URI that identifies the specific occurrence of the problem — typically the path of the affected resource. (example: "/v1/invoices/abc-123") #### 429: Rate limit exceeded. `RATE_LIMIT_EXCEEDED` when the request rate of your credential is over its limit; `TOO_MANY_REQUESTS` when an email the operation sends is held back because too many went out to that recipient in a short time. Either way, retry after the `Retry-After` seconds. `QUOTA_EXCEEDED` is the other `429`: the operation would go over a quota of your plan for the current period (issued invoices, for instance). Retrying does not help until the quota resets or the plan changes. `error.details` carries `feature_code`, `current_usage`, `quota_limit` and `reset_date`, and `RateLimit-Reset` the seconds until the reset when it is known. **Headers:** - `Retry-After` `integer`: Seconds until the rate limit resets - `RateLimit-Limit` `integer`: Maximum requests allowed in the window - `RateLimit-Remaining` `integer`: Remaining requests in the current window - `RateLimit-Reset` `integer`: Seconds until the current window resets **Content `application/json`:** - **success** (required) `boolean`: No description (example: false) - **error** (required) `ErrorDetail` - **meta** `ResponseMeta` - **type** `string` (uri): Stable URI that identifies the problem type and where the integrator will find its documentation. (example: "https://docs.beel.es/errors/INVOICE_NO_LINES") - **title** `string`: Short summary of the problem type. Stable between occurrences of the same `type`. (example: "INVOICE_NO_LINES") - **detail** `string`: Specific message for this occurrence, localized according to `Accept-Language` (`es`, `en`, `ca`); defaults to English. Matches the legacy `error.message`. (example: "The invoice must have at least one line") - **instance** `string` (uri-reference): URI that identifies the specific occurrence of the problem — typically the path of the affected resource. (example: "/v1/invoices/abc-123") **Example:** ```json { "success": false, "error": { "code": "RATE_LIMIT_EXCEEDED", "message": "Too many requests. Please try again in 60 seconds." }, "meta": { "timestamp": "2025-01-15T10:30:00Z", "request_id": "4bf92f3577b34da6a3ce929d0e0e4736" } } ``` #### 500: Internal server error **Content `application/json`:** - **success** (required) `boolean`: No description (example: false) - **error** (required) `ErrorDetail` - **meta** `ResponseMeta` - **type** `string` (uri): Stable URI that identifies the problem type and where the integrator will find its documentation. (example: "https://docs.beel.es/errors/INVOICE_NO_LINES") - **title** `string`: Short summary of the problem type. Stable between occurrences of the same `type`. (example: "INVOICE_NO_LINES") - **detail** `string`: Specific message for this occurrence, localized according to `Accept-Language` (`es`, `en`, `ca`); defaults to English. Matches the legacy `error.message`. (example: "The invoice must have at least one line") - **instance** `string` (uri-reference): URI that identifies the specific occurrence of the problem — typically the path of the affected resource. (example: "/v1/invoices/abc-123") **Example:** ```json { "success": false, "error": { "code": "INTERNAL_ERROR", "message": "Internal server error" }, "meta": { "timestamp": "2025-01-15T10:30:00Z", "request_id": "4bf92f3577b34da6a3ce929d0e0e4736" } } ``` #### default: Any status code the operation does not list above. Every operation declares it, so a generated client always has a branch to fall into and never loses the cause of a failure it did not anticipate. This is where the transport-level answers land — `405`, `406`, `415` and `429` — together with any status a future version of the API starts returning. All of them carry the same error envelope as the codes listed explicitly, so `error.code` is what tells them apart: switching on the status code alone is not enough. See «Transport-level errors» in the API description for when each one is produced. A `402` carrying `SUBSCRIPTION_REQUIRED` lands here when the account has no active subscription. `error.details` says why and what to do: `current_status` (absent if it never had one), `required_permission` and `action`. A `503` carrying `SERVICE_UNAVAILABLE` lands here too, with a `Retry-After` header: a dependency of BeeL itself (the database, the email provider) was momentarily unavailable and nothing was done. Retry after those seconds. A `502` carrying `EXTERNAL_SERVICE_ERROR` also lands here: an outbound integration the operation depends on failed or did not answer in time. It is a transient condition — retry with the same `Idempotency-Key` where the operation accepts one. One exception to the envelope: a failure of the network edge that never reaches the application (`502`, `503`, `504`, `524`) is generated by Cloudflare and its body is not BeeL's — it may not even be JSON. Treat those as "no answer", and retry. **Content `application/json`:** - **success** (required) `boolean`: No description (example: false) - **error** (required) `ErrorDetail` - **meta** `ResponseMeta` - **type** `string` (uri): Stable URI that identifies the problem type and where the integrator will find its documentation. (example: "https://docs.beel.es/errors/INVOICE_NO_LINES") - **title** `string`: Short summary of the problem type. Stable between occurrences of the same `type`. (example: "INVOICE_NO_LINES") - **detail** `string`: Specific message for this occurrence, localized according to `Accept-Language` (`es`, `en`, `ca`); defaults to English. Matches the legacy `error.message`. (example: "The invoice must have at least one line") - **instance** `string` (uri-reference): URI that identifies the specific occurrence of the problem — typically the path of the affected resource. (example: "/v1/invoices/abc-123") **Example:** ```json { "success": false, "error": { "code": "UNSUPPORTED_MEDIA_TYPE", "message": "Unsupported media type: text/plain. Supported: application/json" }, "meta": { "timestamp": "2025-01-15T10:30:00Z", "request_id": "4bf92f3577b34da6a3ce929d0e0e4736" } } ``` --- # Related Schema Definitions ## CustomFieldListResponse - **success** (required) `boolean`: No description (example: true) - **data** (required): The payload. An object for a single resource; an object holding the named collection (and its `pagination`) for a listing. Never a bare array at this level in v1. - **meta** `ResponseMeta` - **data** `object`: No description - **custom_fields** (required) `array[CustomField]`: No description ## SuccessResponse The envelope every successful JSON response of the BeeL. API is wrapped in. There are no bare resources in v1 and none are planned: the payload always hangs off `data`. - A **single resource** is an object in `data`. - A **collection** hangs off a named key inside `data`, together with its `pagination`, also inside `data` — `data: {invoices: [...], pagination: {...}}`. - A collection carries `pagination` unless its operation declares itself a **closed catalogue**: a fixed, bounded list with nothing to page through. The declaration is explicit in the operation; a missing `pagination` is never something to infer. - `GET /v1/accounts` pages by cursor (`data: {accounts: [...], next_cursor}`). It is a documented variant of pagination, not another envelope. Putting the array straight into `data` with `pagination` as its sibling is the shape a v2 would adopt; v1 is not being flipped to it. - **success** (required) `boolean`: No description (example: true) - **data** (required): The payload. An object for a single resource; an object holding the named collection (and its `pagination`) for a listing. Never a bare array at this level in v1. - **meta** `ResponseMeta` ## ResponseMeta - **timestamp** `string` (date-time): No description (example: "2025-01-15T10:30:00Z") - **request_id** `string`: No description (example: "4bf92f3577b34da6a3ce929d0e0e4736") ## CustomField A custom field of the company's invoices, with the options that apply to the query that returned it. - **id** (required) `string` (uuid): Unique identifier of the custom field. (example: "7d2f8a40-3c1e-4b6a-9f0d-2e5b8c1a4d77") - **key** (required) `CustomFieldKey`: Identifier of the custom field within the company, chosen when the field is created: lowercase letters, digits and `_`, up to 64 characters. It never changes. BeeL. gives it no meaning of its own. - **label** (required) `string`: Name people see next to the value, on screen and, if `show_on_pdf`, on the PDF. (example: "Store") - **show_on_pdf** (required) `boolean`: Whether the PDF of the invoice prints this field, in a block of its own under the notes. It applies to invoices saved from then on: an invoice keeps the setting it was saved with. (example: true) - **suggest_values** (required) `boolean`: Whether the field offers the values already used as options. With `true`, saving an invoice reuses an equivalent option or adds the value as a new one. With `false`, for a value that changes on every invoice such as an order number, the invoice stores the text as sent (without leading and trailing spaces), no option is created, and `options` comes back empty. Turning it off deletes no option: the existing ones are kept, can still be listed and managed under `GET /v1/companies/{company_id}/custom-fields/{key}/options`, and are offered again when it is turned back on. (example: true) - **is_archived** (required) `boolean`: An archived field cannot be added to new invoices and is left out of listings unless `include_archived=true`. Invoices that already carry it keep it. (example: false) - **options** (required) `array[CustomFieldOption]`: The options of this field that apply to the query: the common ones plus, when the query names a `customer_id`, the ones of that customer. Archived options appear only with `include_archived=true`. Always empty when `suggest_values` is `false`. To page through every option of the field, of every customer, use `GET /v1/companies/{company_id}/custom-fields/{key}/options`. ## ErrorResponse Error response shared by all BeeL. APIs. The payload carries **two contracts at once** (additive, non-breaking): - **Legacy** (`success`, `error.{code,message,details}`, `meta`) — kept intact for existing consumers. - **RFC 9457** (`type`, `title`, `detail`, `instance`) — new fields for integrators following Problem Details for HTTP APIs. The `type` URI is the stable, shareable link to the error's documentation page (e.g. `https://docs.beel.es/errors/{code}`). Future migration: the legacy fields will be deprecated via `Deprecation`/`Sunset` headers after a sufficient adoption window, and the response Content-Type will move to `application/problem+json`. - **success** (required) `boolean`: No description (example: false) - **error** (required) `ErrorDetail` - **meta** `ResponseMeta` - **type** `string` (uri): Stable URI that identifies the problem type and where the integrator will find its documentation. (example: "https://docs.beel.es/errors/INVOICE_NO_LINES") - **title** `string`: Short summary of the problem type. Stable between occurrences of the same `type`. (example: "INVOICE_NO_LINES") - **detail** `string`: Specific message for this occurrence, localized according to `Accept-Language` (`es`, `en`, `ca`); defaults to English. Matches the legacy `error.message`. (example: "The invoice must have at least one line") - **instance** `string` (uri-reference): URI that identifies the specific occurrence of the problem — typically the path of the affected resource. (example: "/v1/invoices/abc-123") ## ErrorDetail - **code** (required) `string`: No description (example: "VALIDATION_ERROR") - **message** (required) `string`: No description (example: "The provided data is not valid") - **details** `object`: No description (example: {"field":"specific error message"}) ## CustomFieldKey Identifier of the custom field within the company, chosen when the field is created: lowercase letters, digits and `_`, up to 64 characters. It never changes. BeeL. gives it no meaning of its own. Type: `string` ## CustomFieldOption A value of a custom field, offered when filling it in. An option belongs to one customer or, without `customer_id`, is common to every customer of the company. - **id** (required) `string` (uuid): Unique identifier of the option. (example: "c3d4e5f6-a7b8-4c9d-8e0f-1a2b3c4d5e6f") - **value** (required) `string`: Text of the option, exactly as it is shown and copied onto an invoice. (example: "Gran Vía 12") - **customer_id** (required) `string` (uuid): Customer the option belongs to, or `null` for an option common to every customer. It is set when the option is created and never changes. (example: "4f244735-980b-4d9c-80e8-6331fa0b1958") - **is_archived** (required) `boolean`: An archived option is no longer offered and is left out of listings unless `include_archived=true`. Invoices that already carry its text keep it. (example: false) --- Full OpenAPI spec: https://docs.beel.es/api/openapi