Backend Integration

Setup

You can start by downloading your private and public keys to encrypt file and you also have to setup a notification URL so that DOKU can send a notification that the file being processed is completed.

Integration Steps

• Upload File card registration via ABU SFTP Folder

• Hit API Notification to DOKU

• Consume Notification from DOKU

• Download the result file from DOKU Result Folder

Access

DOKU will create user access for merchants to Read & Write in SFTP DOKU according to the environment. Merchants will send their IP for DOKU Whitelist.

Encryption Procedure

Encryption Procedure

1. Merchants generate random String with length 32 digit Alfa Numeric as SALT.

2. Merchants encrypt plain card data using AES 256 Key Size, Chiper ECB, pkcs5 padding with SALT to Base64 encoded format. https://www.devglan.com/online-tools/aes-encryption-decryption

3. Merchants encrypt the SALT using a DOKU RSA Public Key 2048 bit - No Padding to Base64 encoded format. https://www.devglan.com/online-tools/rsa-encryption-decryption

4. Merchants put the data on file (txt format) with content format : {Length_Of_Encrypted_SALT}+{Encrypted_SALT}+{Encrypted_Plain_Card_Data}

   • {Length_Of_Encrypted_SALT} : add padding left with "0", so there will be 4 digits (ex : 0344).

   • {Encrypted_SALT} : in Base64 format.

   • {Encrypted_Plain_Card_Data} : in Base64 format.

5. The txt file data ready to put on DOKU SFTP ./download/ folder

Decryption Procedure

1. Get the length of the Encrypted SALT:

   • Extract the first 4 digits from the data. These 4 digits represent the length of the encrypted SALT.

   • Cast this value into an integer, which will tell you how long the encrypted SALT is.

2. Extract the Encrypted SALT:

   • Use the length obtained in Step 1.

   • Extract a substring from the data starting at index 4. This substring runs from index 4 to (index 4 + the length of the encrypted SALT)

3. Decrypt the Encrypted SALT:

   • Use Merchant RSA Private Key 2048 bit - No Padding decryption to decrypt the extracted Encrypted SALT value.

4. Extract the Encrypted Data:

   • Now, get the remaining part of the card data, starting from index (4 + length of the Encrypted SALT) to the end of the data. This is the encrypted card data.

5. Decrypt the Encrypted Data:

   • Use AES 256 with SALT obtained from step 3 to decrypt the encrypted card data.

Folder

SFTP File

In this document will explain in details how to create file for transaction using SFTP. File Upload

Before putting the file in SFTP, we first need to set up the file itself. You will need to create it in TXT Format.

Example .TXT File :

D000001999128616DOKU0001  5XXXXNNNNNNNNNNN   YYMMAAAAA00001
D000001999128616DOKU0002  5XXXXNNNNNNNNNNN   YYMMAAAAA00002

File Explanation

File Report

After transaction finish DOKU will generate report in TXT format, like Example below. Merchant can get the data in to folder “upload”.

D000000000000002AAAA0001  5185515000000334   5185515000000334   22122212VALID AAAAA00001          V                   
D000000000000002AAAA0002  5185693000000115   5185693000000115   22122212VALID AAAAA00002          V                   
D000000000000002AAAA0003  4005550010538560   5410221000000112   11052212UPDATEAAAAA00003                              

Merchant Notification

Notification API

Request

Here is the sample of request header to notify DOKU

Client-Id: MCH-0001-10791114622547
Request-Id: fdb69f47-96da-499d-acec-7cdc318ab2fe
Request-Timestamp: 2020-08-11T08:45:42Z
Signature: HMACSHA256=1jap2tpgvWt83tG4J7IhEwUrwmMt71OaIk0oL0e6sPM=

Request Header Explanation

Merchant Notify to DOKU

After merchants put file data in SFTP, merchants will trigger DOKU to get data file in SFTP with this API.

Format: REST API (JSON)

Request Body

Example Request:

{
  "file_name": "example.txt"
}

Response Body

Example Response Success:

Http status code: 201

{
  "name": "example.txt",
  "status": "IN_PROCESS"
}

List of error message

DOKU Notify to Merchant

After DOKU create report in SFTP, DOKU will notify merchant to get report.

Guide how to handle payment notification can refer to: https://jokul.doku.com/docs/docs/http-notification/overview

Request

Format: REST API (JSON)

Example :

{
  "service": {
    "id": "ABU"
  },
  "abu_file": {
    "name": "example.txt",
    "status": "DONE",
    "message": "SUCCESS",
    "date": "2021-07-29T13:52:53Z"
  }
}