Verify by Base64

Verify a bank slip using a Base64-encoded image.

Endpoint

POST /verify/bank

Full URL: https://api.easyslip.com/v2/verify/bank

Authentication

Required. See Authentication Guide.

Authorization: Bearer YOUR_API_KEY
Content-Type: application/json

Request

Parameters

Parameter	Type	Required	Description
base64	string	Yes	Base64 encoded image (with or without data URI prefix)
remark	string	No	Custom remark (1-255 characters)
matchAccount	boolean	No	Match receiver with registered accounts
matchAmount	number	No	Expected amount to validate
checkDuplicate	boolean	No	Check for duplicate slip

Base64 Format

Both formats are accepted:

# With data URI prefix
data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAA...

# Without prefix
/9j/4AAQSkZJRgABAQAA...

Image Requirements

Requirement	Value
Maximum decoded size	4 MB
Supported formats	JPEG, PNG, GIF, WebP

Type Definitions

// Request
interface VerifyByBase64Request {
  base64: string;           // Base64 encoded image
  remark?: string;          // 1-255 chars
  matchAccount?: boolean;
  matchAmount?: number;
  checkDuplicate?: boolean;
}

// Response
interface VerifyBankResponse {
  success: true;
  data: VerifyBankData;
  message: string;
}

interface VerifyBankData {
  remark?: string;
  isDuplicate: boolean;
  matchedAccount: MatchedAccount | null;
  amountInOrder?: number;
  amountInSlip: number;
  isAmountMatched?: boolean;
  rawSlip: RawSlip;
}

// See POST /verify/bank for full type definitions

Examples

cURL

curl -X POST https://api.easyslip.com/v2/verify/bank \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "base64": "data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAA...",
    "checkDuplicate": true
  }'

Browser

// Convert file to Base64
const fileToBase64 = (file) => {
  return new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.onload = () => resolve(reader.result);
    reader.onerror = reject;
    reader.readAsDataURL(file);
  });
};

// Verify slip
const verifyByBase64 = async (base64, options = {}) => {
  const response = await fetch('https://api.easyslip.com/v2/verify/bank', {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer YOUR_API_KEY',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({ base64, ...options })
  });

  const result = await response.json();

  if (!result.success) {
    throw new Error(result.error.message);
  }

  return result.data;
};

// Usage with file input
const fileInput = document.getElementById('slipImage');
fileInput.addEventListener('change', async (e) => {
  const file = e.target.files[0];
  const base64 = await fileToBase64(file);

  try {
    const slip = await verifyByBase64(base64, { checkDuplicate: true });
    console.log('Amount:', slip.rawSlip.amount.amount);
  } catch (error) {
    console.error('Error:', error.message);
  }
});

Node.js

import fs from 'fs';

const verifyByBase64 = async (base64, options = {}) => {
  const response = await fetch('https://api.easyslip.com/v2/verify/bank', {
    method: 'POST',
    headers: {
      'Authorization': `Bearer ${process.env.EASYSLIP_API_KEY}`,
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({ base64, ...options })
  });

  const result = await response.json();

  if (!result.success) {
    throw new Error(result.error.message);
  }

  return result.data;
};

// Usage with file
const imageBuffer = fs.readFileSync('./slip.jpg');
const base64 = imageBuffer.toString('base64');
const slip = await verifyByBase64(base64, { checkDuplicate: true });
console.log('Amount:', slip.rawSlip.amount.amount);

PHP

function verifyByBase64(string $base64, array $options = []): array
{
    $apiKey = getenv('EASYSLIP_API_KEY');
    $data = array_merge(['base64' => $base64], $options);

    $ch = curl_init();
    curl_setopt_array($ch, [
        CURLOPT_URL => 'https://api.easyslip.com/v2/verify/bank',
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_POST => true,
        CURLOPT_HTTPHEADER => [
            'Authorization: Bearer ' . $apiKey,
            'Content-Type: application/json'
        ],
        CURLOPT_POSTFIELDS => json_encode($data)
    ]);

    $response = curl_exec($ch);
    curl_close($ch);

    $result = json_decode($response, true);

    if (!$result['success']) {
        throw new Exception($result['error']['message']);
    }

    return $result['data'];
}

// Usage with file
$imageData = file_get_contents('/path/to/slip.jpg');
$base64 = base64_encode($imageData);

$slip = verifyByBase64($base64, ['checkDuplicate' => true]);
echo "Amount: " . $slip['rawSlip']['amount']['amount'];

Python

import requests
import base64
import os

def verify_by_base64(base64_data: str, **options) -> dict:
    response = requests.post(
        'https://api.easyslip.com/v2/verify/bank',
        headers={
            'Authorization': f'Bearer {os.environ["EASYSLIP_API_KEY"]}',
            'Content-Type': 'application/json'
        },
        json={'base64': base64_data, **options}
    )

    result = response.json()

    if not result['success']:
        raise Exception(result['error']['message'])

    return result['data']

# Usage with file
with open('./slip.jpg', 'rb') as f:
    image_data = f.read()
    base64_data = base64.b64encode(image_data).decode('utf-8')

slip = verify_by_base64(base64_data, checkDuplicate=True)
print(f"Amount: {slip['rawSlip']['amount']['amount']}")

Response

Success (200)

{
  "success": true,
  "data": {
    "isDuplicate": false,
    "rawSlip": {
      "payload": "00000000000000000000000000000000000000000000000",
      "transRef": "68370160657749I376388B35",
      "date": "2024-01-15T14:30:00+07:00",
      "amount": {
        "amount": 1500.00
      },
      "sender": {
        "bank": { "id": "004", "name": "กสิกรไทย", "short": "KBANK" },
        "account": { "name": { "th": "นาย ผู้โอน ทดสอบ" } }
      },
      "receiver": {
        "bank": { "id": "014", "name": "ไทยพาณิชย์", "short": "SCB" },
        "account": { "name": { "th": "นาย รับเงิน ทดสอบ" } }
      }
    }
  },
  "message": "Bank slip verified successfully"
}

Error Responses

Invalid Base64 (400)

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid Base64 data"
  }
}

Image Size Too Large (400)

{
  "success": false,
  "error": {
    "code": "IMAGE_SIZE_TOO_LARGE",
    "message": "Image size exceeds 4MB limit"
  }
}

Notes

• Compress images before encoding to reduce payload size
• Use JPEG quality 0.7-0.9 for sufficient quality
• Including the data URI prefix helps with MIME type detection
• Clear Base64 strings from memory after use in sensitive applications