INVALID_REQUEST (value: "invalid_request")

UNAUTHORIZED (value: "unauthorized")

PAYMENT_REQUIRED (value: "payment_required")

INSUFFICIENT_CREDITS (value: "insufficient_credits")

INSUFFICIENT_CREDITS_TO_SEND (value: "insufficient_credits_to_send")

FORBIDDEN (value: "forbidden")

UPGRADE_REQUIRED (value: "upgrade_required")

ACCOUNT_SUSPENDED (value: "account_suspended")

NOT_FOUND (value: "not_found")

METHOD_NOT_ALLOWED (value: "method_not_allowed")

CONFLICT (value: "conflict")

GONE (value: "gone")

REQUEST_TOO_LARGE (value: "request_too_large")

UNSUPPORTED_MEDIA_TYPE (value: "unsupported_media_type")

VALIDATION_FAILED (value: "validation_failed")

INVALID_DATA (value: "invalid_data")

RATE_LIMITED (value: "rate_limited")

DAILY_EMAIL_LIMIT_REACHED (value: "daily_email_limit_reached")

INTERNAL_ERROR (value: "internal_error")

BAD_GATEWAY (value: "bad_gateway")

SERVICE_UNAVAILABLE (value: "service_unavailable")

UPSTREAM_TIMEOUT (value: "upstream_timeout")

POLLING_TIMEOUT (value: "polling_timeout")

IDEMPOTENCY_KEY_IN_USE (value: "idempotency_key_in_use")

IDEMPOTENCY_KEY_REUSED (value: "idempotency_key_reused")