The connection timeout applies to each attempt, while retry delays add elapsed time. Review connectionTimeout, maxRetries, backoff settings, and retries performed by the queue or framework.
The result is unknown, not necessarily failed. Query by resource ID or external reference before repeating the same payload with the same idempotency key.
setCustomHeaders() expects a list such as ['X-Idempotency-Key: value']. An associative array like ['X-Idempotency-Key' => 'value'] does not match the SDK format.
Confirm that the web server forwards unchanged x-request-id and data.id values, then check clock synchronization and the endpoint secret. Do not validate unsigned QR Code notifications.
Include SDK and PHP versions, operation, HTTP status, request ID, sanitized exception type/message, and a minimal reproduction. Open a repository issue without credentials, card data, webhook secrets, or exploit details.