{"id":3042,"date":"2025-05-25T18:59:06","date_gmt":"2025-05-25T10:59:06","guid":{"rendered":"https:\/\/www.deekpay.com\/?p=3042"},"modified":"2025-05-25T18:59:06","modified_gmt":"2025-05-25T10:59:06","slug":"%e5%ad%9f%e5%8a%a0%e6%8b%89%e6%94%af%e4%bb%98%e6%b2%99%e7%ae%b1%e7%8e%af%e5%a2%83%e6%b5%8b%e8%af%95%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/www.deekpay.com\/en\/2025\/05\/25\/%e5%ad%9f%e5%8a%a0%e6%8b%89%e6%94%af%e4%bb%98%e6%b2%99%e7%ae%b1%e7%8e%af%e5%a2%83%e6%b5%8b%e8%af%95%e6%8c%87%e5%8d%97\/","title":{"rendered":"Bangladesh Payment Sandbox Environment Testing Guidelines"},"content":{"rendered":"<h1>Bangladesh Payment Sandbox Environment Testing Guidelines<\/h1>\n<h2>1. Overview<\/h2>\n<p>This guide provides developers and testers with detailed instructions for integration and testing in the sandbox environment of the Bangladesh Payment System. The sandbox environment simulates the behaviour of a real payment system, but does not involve actual money flows.<\/p>\n<h2>2. Obtaining access<\/h2>\n<h3>2.1 Registration process<\/h3>\n<ul>\n<li><strong>Step 1<\/strong>: Access<a href=\"https:\/\/developer.nbp.gov.bd\">Central Bank of Bangladesh (NBP) Developer Portal<\/a><\/li>\n<li><strong>Step 2<\/strong>: Fill in the developer registration form and provide the necessary documents (company registration certificate, tax ID, etc.)<\/li>\n<li><strong>Step 3<\/strong>: Waiting for review (usually takes 3-5 working days)<\/li>\n<\/ul>\n<h3>2.2 API Key Acquisition<\/h3>\n<p>After passing the review, you will receive:<\/p>\n<ul>\n<li>Sandbox API key<\/li>\n<li>Merchant ID\/Test Account<\/li>\n<li>API Documentation Access<\/li>\n<\/ul>\n<h2>3. Sandbox endpoint URLs<\/h2>\n<table>\n<thead>\n<tr>\n<th>Type of service<\/th>\n<th>Sandbox URL<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>OAuth authentication<\/td>\n<td><code>https:\/\/api-sandbox.nbp.gov.bd\/oauth\/token<\/code><\/td>\n<\/tr>\n<tr>\n<td>QR payments<\/td>\n<td><code>https:\/\/api-sandbox.nbp.gov.bd\/qr\/v1\/payments<\/code><\/td>\n<\/tr>\n<tr>\n<td>P2P transfers<\/td>\n<td><code>https:\/\/api-sandbox.nbp.gov.bd\/payment\/v1\/transfers<\/code><\/td>\n<\/tr>\n<tr>\n<td>Bill Payment<\/td>\n<td><code>https:\/\/api-sandbox.nbp.gov.bd\/billpay\/v1\/payments<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>4. Test Credentials (for testing purposes only)<\/h2>\n<h3>Merchant Account.<\/h3>\n<pre><code>Merchant ID: TESTMERCH001 <br>\r\nAPI Key: sb_test_1234567890abcdefghijklmnopqrstuvwxyz <br>\r\n<\/code><\/pre>\n<h3>Customer account.<\/h3>\n<pre><code>Mobile Wallet: +88017XXXXXXXXXX (use any number starting with +88017)<br>\r\nPIN:1234 (common to all test accounts) <br>\r\n<\/code><\/pre>\n<p>5 . Sample Code for Common Trading Scenarios (Python)<\/p>\n<pre><code class=\"language-python\">import requests<br>\r\n<br>\r\n# OAuth authentication to get token<br>\r\nauth_url = \"https:\/\/api-sandbox.nbp.gov.bd\/oauth\/token\"<br>\r\nheaders = {<br>\r\n    \"Content-Type\": \"application\/x-www-form-urlencoded\",<br>\r\n    \"Authorization\": \"Basic [base64 encoded client_id:client_secret]\"<br>\r\n}<br>\r\ndata = {<br>\r\n    \"grant_type\": \"client_credentials\"<br>\r\n}<br>\r\nresponse = requests.post(auth_url, headers=headers, data=data)<br>\r\naccess_token = response.json()[\"access_token\"]<br>\r\n<br>\r\n# QR Payment Request Example<br>\r\nqr_payload = {<br>\r\n    \"merchantId\": \"[YOUR_MERCHANT_ID]\",<br>\r\n    \"amount\":100,<br>\r\n    # ... Refer to API documentation for other required fields...<br>\r\n}<br>\r\n<br>\r\nqr_headers={<br>\r\n   'Authorization': f'Bearer {access_token}',<br>\r\n   'Content-Type':'application\/json'<br>\r\n}<br>\r\n<br>\r\nqr_response=requests.post(<br>\r\n   'https:\/\/api-sandbox.nbp.gov.bd\/qr\/v1\/payments',<br>\r\n   json=qr_payload.<br>\r\n   headers=qr_headers  <br>\r\n) <br>\r\n<br>\r\nprint(qr_response.json())<br>\r\n<\/code><\/pre>\n<p>6 . Error Handling and Debugging Tips<\/p>\n<p>Common HTTP status codes.<br \/>\n-400 Bad Request \u2192 Check if the request format is correct.<br \/>\n-401 Unauthorized \u2192Verify that your API key\/OAuth token is valid and not expired<br \/>\n-403 Forbidden\u2192Confirm that your merchant account has the permission to perform this operation.<\/p>\n<p>Logging recommendations.<\/p>\n<pre><code class=\"language-bash\">curl-v-X POST\\ https:\/... \\<br>\r\n-\"Authorisation:Bearer $TOKEN\"\\<br>\r\n-d@request_body.json&gt;response.log   <br>\r\n<\/code><\/pre>\n<p>7 . Restrictions and quotas<\/p>\n<p>The SandBox environment has the following limitations:<br \/>\n-The amount of a single transaction does not exceed Tk. 100,000 (BDT)<br \/>\n-Accumulated daily transactions not exceeding Tk. 500,000 per day<br \/>\n-Up to 30 API calls per minute<\/p>\n<p>8 . Support channels<\/p>\n<p>The following are ways to get help when you have a problem:<br \/>\n-Email.<a href=\"mailto:support@nbpsandox.org\">support@nbpsandox.org<\/a><br \/>\n-Slack.<a href=\"http:\/\/\/en\/slack.developers..nbpsb.org\/\">NBP Developer Community<\/a><br \/>\n-Tel: +880XXXXXXX (Mon-Fri 9AM-5PM GMT+6)<\/p>\n<h1>Guidelines for testing the payment sandbox environment in Bangladesh (continued)<\/h1>\n<h2>9. Test case design recommendations<\/h2>\n<h3>9.1 Core payment scenarios<\/h3>\n<ul>\n<li><strong>Successful Payment Process<\/strong>: Small amount (10 BDT), standard amount (500 BDT), boundary value (99,999 BDT)<\/li>\n<li><strong>failure scenario<\/strong>::\n<ul>\n<li>PIN Error Continuous Entry (Tested 3 times for locking mechanism)<\/li>\n<li>Insufficient Balance Transactions<\/li>\n<li>QR code expired transaction (default 15 minutes expiry)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>9.2 API Validation Matrix<\/h3>\n<table>\n<thead>\n<tr>\n<th>API method<\/th>\n<th>HTTP status code<\/th>\n<th>JSON Response Fields<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>POST \/payments<\/td>\n<td><code>201 Created<\/code><\/td>\n<td><code>transactionId<\/code>, <code>status: \"PENDING\"<\/code><\/td>\n<\/tr>\n<tr>\n<td>GET \/transactions\/{id}<\/td>\n<td><code>200 OK<\/code><\/td>\n<td><code>settlementAmount<\/code>, <code>feeDetails<\/code><\/td>\n<\/tr>\n<tr>\n<td>DELETE \/payments\/{id} (refund)<\/td>\n<td><code>202 Accepted<\/code><\/td>\n<td><code>reversalReference<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>10 . Local simulation tools<\/p>\n<h3>Docker image rapid deployment:<\/h3>\n<pre><code class=\"language-bash\">docker run -p8080:8080 nbp\/sandbox-simulator:v2.4 \\<br>\r\n-e MOCK_RESPONSE_DELAY=200ms \\<br>\r\n-e FAILURE_RATE=5%<br>\r\n<\/code><\/pre>\n<p>Configuration parameter description:<\/p>\n<ul>\n<li>DELAY_MS: Analogue network delay (default 150ms)<\/li>\n<li>FAILURE_RATE: percentage of automated failed requests (for stress testing)<\/li>\n<\/ul>\n<p>11 . Security Compliance Requirements<\/p>\n<p>The protective measures that must be realised:<\/p>\n<ol>\n<li>\n<p><strong>encrypted transmission<\/strong>: Mandatory use of TLS 1.2+ for all requests<\/p>\n<pre><code class=\"language-nginx\"># Nginx Sample Configuration<br>\r\nssl_protocols TLSv1.2 TLSv1.3.<br>\r\nssl_ciphers HIGH:!aNULL:!MD5;<br>\r\n<\/code><\/pre>\n<\/li>\n<li>\n<p><strong>Sensitive data desensitisation<\/strong>::<\/p>\n<pre><code class=\"language-python\"># Python Log Filtering Example <br>\r\nimport logging <br>\r\n<br>\r\nclass SensitiveDataFilter(logging.Filter).<br>\r\n    def filter(self, record).<br>\r\n        if 'pin' in record.getMessage().lower():<br>\r\n            return False  <br>\r\n        return True <br>\r\n<\/code><\/pre>\n<\/li>\n<\/ol>\n<p>3.<strong>Accreditation Enhancement Recommendations<\/strong><\/p>\n<pre><code class=\"language-http\">POST \/auth\/token HTTP\/1.<br>\r\nHOST : api-sandbox.nbp.gov.bd  <br>\r\nAuthorization : Basic base64(client_id:SHA256(client_secret+timestamp))<br>\r\nx-timestamp :20240605t143812z  <br>\r\n<\/code><\/pre>\n<p>12 . Performance benchmark reference<\/p>\n<p>Measured on AWS t3.xlarge instance.<br \/>\n-Average response time : 120\u00b125ms (P95)<br \/>\n-Throughput: 220TPS (under sustained load)<br \/>\n-Cold start latency: 300-500ms extra for the first call<\/p>\n<p>13 . Production switchover checklist<\/p>\n<p>After completing the sandbox test, please confirm:<\/p>\n<p>\u2705 [ ] IP whitelisting has been submitted to the NBP Ops team<br \/>\n\u2705 [ ] SSL certificate is issued by a trusted CA and has not expired<br \/>\n\u2705 [ ] Error Code processing coverage up to 100%<br \/>\n\u2705 [ ] Mock data and real accounts complete switchover<\/p>\n<hr>\n<p>To obtain the full version of \"Specification for Integration of Electronic Payment Systems in Bangladesh\" in PDF, please send a formal request email to<a href=\"mailto:standards@nbp.gov.bd\">standards@nbp.gov.bd<\/a> , email subject format: \"[API DOC REQUEST] {company name}\"<\/p>","protected":false},"excerpt":{"rendered":"<p>Bangladesh Payment Sandbox Environment Testing Guide 1. 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