> For the complete documentation index, see [llms.txt](https://docs.iexexchanger.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.iexexchanger.com/get-started/exchanger-api/spravochnik/common-issues.md).

# Решение частых проблем

## `401 authentication_required`

Check:

* `Authorization: Bearer ...` header exists;
* token was copied completely;
* token was not revoked;
* request is sent to the correct domain and `/api/v3` path.

## `401 invalid_signature`

Check:

* path in signature includes `/api/v3`;
* body hash is calculated from exact body bytes;
* query canonicalization is sorted and RFC3986-encoded;
* timestamp is current;
* nonce was not reused;
* API HMAC secret is used, not webhook secret.

## `403 scope_denied`

У ключа нет нужного scope. Сравните endpoint со страницей [Все endpoints](/get-started/exchanger-api/spravochnik/endpoints.md), затем попросите владельца аккаунта или администратора добавить нужные права.

## `403 ip_not_allowed`

The request came from an IP that is not in the key allow-list.

Fix:

* add all production egress IPs;
* check NAT/load balancer public IP;
* проверьте, не отличаются ли IP в staging и production.

## `409 idempotency_conflict`

The same `Idempotency-Key` was used with a different method, path or body.

Fix:

* reuse the same key only for the same business operation;
* generate a new key for a new order;
* do not mutate body between retries.

## `422 validation_error`

The payload is missing required fields or has invalid values.

Fix:

* call `capabilities` before building the form;
* call `preflight` before `create order`;
* show `missing_fields` to the user;
* validate amount against min/max limits.

## `429 rate_limit_exceeded`

The integration is sending too many requests.

Fix:

* wait for `Retry-After`;
* use exponential backoff;
* cache routes and payment systems briefly;
* use webhooks instead of frequent polling.

## Не проходит подпись webhook

Check:

* receiver uses raw body, not re-encoded JSON;
* correct webhook secret is used;
* signature header includes `sha256=`;
* timestamp and nonce headers are passed correctly;
* body parser does not consume raw bytes before verification.

## Заявка создалась два раза

Скорее всего интеграция повторила запрос без `Idempotency-Key` или использовала новый ключ для повтора.

Fix:

* always send `Idempotency-Key` for `POST /private/exchange/orders`;
* store key with local checkout/session;
* retry timeout with the same key.


---

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