> For the complete documentation index, see [llms.txt](https://developers.doku.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.doku.com/flexibill/doku-biller/response-code.md). # Response Code A **response code** is a four-digit number returned by a server to indicate the outcome of a client's request. Our response codes consist of **4 digits** in the format **`XXYY`**, where: * **`XX`** → Represents the error category (first 2 digits). * **`YY`** → Specifies the error details (last 2 digits). Bellow is the description of error category (`XX`)

Code	Description
`U0` / `U1`	Error caused by user mistakes (User Error)
`IT`	Error due to partner system failure (H2H Integration)
`SY`	Error in DOKU switching system
`UE`	Other errors that are not yet mapped

## Success Code When you get the response code bellow, hold the payment amount from customer.

Code	Message	State	Detail
`0000`	Success	Payment, Inquiry, Advice	The server successfully processed the request, and the response contains the requested data or confirmation of the action performed.
`5586`	Transaction on process/pending. hit advice to get final status transaction.	Payment	The transaction is pending; the partner will receive a callback or must send an advice request to obtain the transaction status.

## Error Code: ### Category "`U0` / `U1`"

Code	Message	State	Description
`U000`	Invalid billing id/phone number.	Inquiry, payment	User fault, user need to re-input the billing number.
`U001`	Bill already paid.	Inquiry	The billing number entered by the user does not have any outstanding charges.
`U002`	Blocked billing ID, please contact your billing provider.	Inquiry
`U003`	Billing cut off time, transaction cannot proceed. Please try again later.	Payment
`U004`	Duplicate Transaction, Please try with another customer biller	Payment	User submit transaction with the same id pelanggan / phone number in the same time.
`U101`	Tagihan Sudah Dibayar melalui CA lain	Inquiry, Payment	Specifically for the LPL biller, for bills with response code 27, where the bill has already been paid elsewhere either after the inquiry or before the inquiry.
`U102`	Tagihan Sudah Kadaluwarsa/Expired	Inquiry, Payment	Specifically for the LPL biller, for bills with response code 02, where the bill has already expired.
`U103`	Exceed limit KWh.	Payment	The purchased kWh amount has reached the maximum limit for the month. Each customer ID has a different maximum limit. For more details, please contact PLN 123.

### Category "`IT`"

Code	Message	State	Description
`IT01`	Invalid parameter [ParamName] request.	Inquiry, payment, advice	There is a formatting error in the parameter input, such as incorrect date or amount format.
`IT02`	Inquiry not found, please check inquiryid and customer_id from inquiry.
`IT03`	Inquiry ID already paid.	Payment	Inquiry ID that has already been paid before, to avoid double payment with the same inquiry request.
`IT04`	Payment amount not equal with inquiry response.	Payment	The amount at the time of payment differs from the amount in the inquiry result.
`IT05`	Unregistered / Inactive product.	Inquiry	The requested Biller ID / Product ID is not registered or inactive.
`IT06`	Duplicate systrace.	Inquiry	The same Systrace cannot be sent in two different requests.
`IT07`	IP not registered.	Inquiry	IP’s partner not registered in DOKU Biller.
`IT08`	Insufficient partners deposit balance	Payment	The partner's deposit balance is insufficient; the partner is required to top up the balance to proceed with the transaction.
`IT09`	Duplicate Request ID, please check your system	Inquiry, Payment

### Category "`SY`"

Code	Message	State	Description
`SY00`	Internal server error	Inquiry, Payment. Advice	Doku's system is under maintenance.
`SY01`	Insufficient deposit balance	Payment	Doku's deposit balance in biller is insufficient.
`SY06`	Temporary error from biller, please try again.		The product temporary close or biller system is under maintenance.