> For the complete documentation index, see [llms.txt](https://docs.coda.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.coda.co/codapay/direct-api-integration/direct-api-integration-for-alternative-payment-methods/backend-call-flow/carrier-billing-dcb.md).

# Carrier Billing (DCB)

## Carrier Billing Call Flow

<figure><img src="/files/7RALt93OZHvpH6IAk3U9" alt=""><figcaption></figcaption></figure>

### Carrier Billing MT-MO Authentication Flow

In **Carrier Billing MT-MO authentication**, the customer receives instructions via SMS and authorizes the transaction by responding with an SMS based on those instructions.

<figure><img src="/files/ns2XomTfTpVSjASNGpTE" alt=""><figcaption></figcaption></figure>

### Carrier Billing MO Authentication Flow

In **Carrier Billing MO authentication**, authorization is also completed via SMS. However, the partner's payment page must provide clear instructions on how to proceed with the SMS authentication process.

<figure><img src="/files/FYU1fvpPLRwn87sgH7mM" alt=""><figcaption></figcaption></figure>

## Request Message

<table><thead><tr><th width="148">Parameters</th><th width="95">Type</th><th width="116">Length</th><th>Description</th></tr></thead><tbody><tr><td>api_key</td><td>String</td><td>256</td><td><strong>Mandatory</strong><br>API key provided by Coda. Refer to <a data-mention href="/pages/SJ2KtFdcmUYgMDiplZT1">/pages/SJ2KtFdcmUYgMDiplZT1</a> to find out how to get it.</td></tr><tr><td>project_id</td><td>String</td><td>10</td><td><p>*<strong>This field is only needed for v2.0 API</strong></p><p><strong>Mandatory</strong> </p><p>Project ID provided by Coda, unique for each title product. Refer to <a data-mention href="/pages/SJ2KtFdcmUYgMDiplZT1">/pages/SJ2KtFdcmUYgMDiplZT1</a> to find out how to get it.</p></td></tr><tr><td>order_id</td><td>String</td><td>64</td><td><p><strong>Mandatory</strong> </p><p>Your unique identifier for the transaction</p></td></tr><tr><td>country</td><td>Number</td><td>N/A</td><td><strong>Mandatory</strong><br>ISO 3166 based country code. Can refer to <a data-mention href="/pages/7B3qZnefeSwkSs84sKuB">/pages/7B3qZnefeSwkSs84sKuB</a></td></tr><tr><td>lang</td><td>String</td><td>2</td><td><p><strong>Mandatory</strong></p><p>2-character language code. See <a data-mention href="/pages/lumiE4ZV7er3NqdusLTc">/pages/lumiE4ZV7er3NqdusLTc</a>for options.</p></td></tr><tr><td>type</td><td>Number</td><td>1</td><td>1: Digital content,<br>2: Non-digital content</td></tr><tr><td>pay_type</td><td>Number</td><td>1</td><td><p><strong>Mandatory</strong></p><p>Carrier Billing use pay_type = 1<br><br>For Carrier billings, if customers enter MSISDN of different carrier billings than the carrier billings in request message, the transaction will be failed with error 240. </p><p></p><p>Refer <a data-mention href="/pages/H5smNhrW5H8UuJgvQJ6Y">/pages/H5smNhrW5H8UuJgvQJ6Y</a> for more details</p></td></tr><tr><td>mno_code</td><td>Number</td><td>N/A</td><td><p><strong>Mandatory</strong></p><p>Mobile Network Code. If empty, Coda selects available MNO.</p></td></tr><tr><td>msisdn</td><td>Number</td><td>15</td><td><p><strong>Optional</strong></p><p>MSISDN (non-formatted; without country code).<br><br>Only include this if MSISDN is required and not email.</p></td></tr><tr><td>merchant_name</td><td>String</td><td>128</td><td><p><strong>Optional</strong></p><p>The merchant name that will be displayed in an SMS message, if the partner wants to specify the partner name, please enter the name in this field.<br></p><p>The default value is empty.</p></td></tr><tr><td>items</td><td>ItemInfo</td><td>N/A</td><td><p><strong>Mandatory</strong></p><p>List of items being purchased by the users</p></td></tr><tr><td>items[].code</td><td>String</td><td>128</td><td><p><strong>Mandatory</strong></p><p>Code associated with the item on your side</p></td></tr><tr><td>items[].name</td><td>String</td><td>128</td><td><strong>Mandatory</strong> Name of the item being purchased. Only supports latin characters.</td></tr><tr><td>items[].price</td><td>Number</td><td>N/A</td><td><strong>Mandatory</strong><br>Price of the item inclusive of any taxes in the currency specified in the request.</td></tr><tr><td>items[].type</td><td>Number</td><td>N/A</td><td><strong>Mandatory</strong><br>Default=1</td></tr><tr><td>profile</td><td>Map</td><td>N/A</td><td><strong>Mandatory</strong><br>Refer Profile Info below for more details</td></tr></tbody></table>

## Profile Info

<table><thead><tr><th width="165">Parameters</th><th width="101">Type</th><th width="83">Length</th><th>Description</th></tr></thead><tbody><tr><td>user_id</td><td>String</td><td>128</td><td><p><strong>Mandatory</strong> </p><p>Your user's unique identifier</p></td></tr><tr><td>client_ip</td><td>String</td><td>15</td><td><strong>Optional</strong><br>Customer IP Address (only support IPv4)</td></tr><tr><td>user_agent</td><td>String</td><td>512</td><td><strong>Optional</strong><br>Customer's user agent data (details of browser and operating system)</td></tr><tr><td>email</td><td>String</td><td></td><td><p><strong>Optional</strong></p><p>The email address where the successful transaction receipt will be sent. Upon a successful payment, Coda will automatically deliver a digital receipt to this address. <em>This feature is not enabled by default. To activate automated receipt delivery for your titles, please contact the payment enablement team at</em> <a href="mailto:codapay_integration@coda.co"><em>codapay_integration@coda.co</em></a><em>.</em><br></p><p><em>Receipt example:</em> <img src="/files/VpemzyLCFf0d472Nomf0" alt=""></p></td></tr></tbody></table>

### Sample Request

{% tabs %}
{% tab title="v2.0 with MSISDN" %}

<pre class="language-json"><code class="lang-json"><strong>{
</strong>  "project_id": "1", //This field is only needed for v2.0 API
  "country": "702",
  "api_key": "test_e944d44f065eade8157737385a09",
  "order_id": "&#x3C;Your OrderID>",
  "lang": "en",
  "merchant_name": "Codapay",
  "type": "1",
  "pay_type": "1",
  "mno_code": "52503",
  "msisdn": "&#x3C;Your number>",
  "items": [
    {
      "code": "5",
      "name": "Test Item",
      "price": 60.0
    }
  ],
  "profile": {
    "user_id": "12345"

  }
}
</code></pre>

{% endtab %}

{% tab title="v2.0 without MSISDN" %}

```json
{
  "project_id": "1", //This field is only needed for v2.0 API
  "country": "702",
  "api_key": "test_e944d44f065eade8157737385a09",
  "order_id": "<Your OrderID>",
  "lang": "en",
  "merchant_name": "Codapay",
  "type": "1",
  "pay_type": "1",
  "mno_code": "52503",
  "items": [
    {
      "code": "5",
      "name": "Test Item",
      "price": 60.0
    }
  ],
  "profile": {
    "user_id": "12345"

  }
}
```

{% endtab %}

{% tab title="v1 with MSISDN " %}

```json
{
  "api_key": "<API Key>",
  "order_id": "<Your OrderID>",
  "lang": "en",
  "pay_type": 1,
  "msisdn": "<Your number>",
  "mno_code": 22,
  "merchant_name": "Codapay",
  "type": 1,
  "items": [
    {
      "code": "1",
      "name": "One Day",
      "price": 10000,
      "type": 1
    }
  ],
  "profile": {
    "user_id": "12345"
  }
}
```

{% endtab %}

{% tab title="v1 without MSISDN" %}

```json
{
  "api_key": "<API Key>",
  "order_id": "<Your OrderID>",
  "lang": "en",
  "pay_type": 1,
  "mno_code": 22,
  "merchant_name": "Codapay",
  "type": 1,
  "items": [
    {
      "code": "1",
      "name": "One Day",
      "price": 10000,
      "type": 1
    }
  ],
  "profile": {
    "user_id": "12345"
  }
}
```

{% endtab %}
{% endtabs %}

## Response Message

<table><thead><tr><th width="153.33333333333331">Parameters</th><th width="141">Type</th><th width="94">Length</th><th>Description</th></tr></thead><tbody><tr><td>result_code</td><td>Number</td><td>N/A</td><td>Success or Error code. Success = 0.<br><br>Error Code list please refer to <a data-mention href="/pages/Ijfanb3Eb2mtXRsbF81n">/pages/Ijfanb3Eb2mtXRsbF81n</a></td></tr><tr><td>result_desc</td><td>String</td><td>512</td><td>If the resultCode is an error, this value describes the error.<br><a data-mention href="/pages/Ijfanb3Eb2mtXRsbF81n">/pages/Ijfanb3Eb2mtXRsbF81n</a></td></tr><tr><td>txn_id</td><td>Number</td><td>N/A</td><td>Unique payment transaction identifier.</td></tr><tr><td>txn_timeout</td><td>Number</td><td>N/A</td><td>Transaction Timeout in Minutes.</td></tr><tr><td>total_price</td><td>Number</td><td>N/A</td><td>The total amount the user has paid for the transaction. This will always be in local currency.</td></tr><tr><td>pay_instructions</td><td>String</td><td>15</td><td>If this value is populated, partner should display the instructions provided on screen to the customer.</td></tr><tr><td>profile</td><td>Object</td><td>N/A</td><td>Refer the Profile info below for more details</td></tr></tbody></table>

## Profile Info

<table><thead><tr><th width="157.33333333333331">Parameters</th><th width="131">Type</th><th width="117">Length</th><th>Description</th></tr></thead><tbody><tr><td>extInfoByte</td><td>N/A</td><td>N/A</td><td>Please ignore this field.</td></tr><tr><td>redirect_url</td><td>String</td><td>128</td><td>The payment gateway's redirect URL is returned only if the selected payment channel follows a redirect URL workflow.</td></tr><tr><td>merchantType</td><td>String</td><td>128</td><td>Please ignore this field.</td></tr></tbody></table>

### Sample Response

{% tabs %}
{% tab title="Sample with msisdn" %}

```json
{
    "txn_id": 7395215708672061682,
    "txn_timeout": 11,
    "result_code": 0,
    "total_price": 100.0,
    "pay_instructions": "We just sent an SMS to xxxxxx. To complete the transaction, send \"PAY\" followed by five digits code from the SMS to 75457. Example: PAY 12345.",
    "profile": {
        "extInfoByte": "0",
        "user_id": "12345",
        "merchantType": "Codapay"
    }
}
```

{% endtab %}

{% tab title="Sample without msisdn" %}

```json
{
    "txn_id": 7395215708672061123,
    "txn_timeout": 61,
    "result_code": 0,
    "total_price": 1000.0,
    "pay_instructions": "",
    "profile": {
        "extInfoByte": "0",
        "user_id": "12345",
        "merchantType": "Codapay",
        "redirect_url": "https://sample_URL.com"
    }
}
```

{% endtab %}
{% endtabs %}

## Mobile Operator Codes

<table><thead><tr><th width="151">Country</th><th width="232">Payment Channels (MNO)</th><th width="107">Auth Type</th><th>Network Code</th></tr></thead><tbody><tr><td>Bangladesh</td><td>Robi</td><td>N/A</td><td>47002</td></tr><tr><td>Indonesia</td><td>Indosat</td><td>MT-MO</td><td>51001 or 51021</td></tr><tr><td>Indonesia</td><td>Telkomsel</td><td>MT-MO</td><td>51010 or 51020</td></tr><tr><td>Indonesia</td><td>TRI</td><td>MT-MO</td><td>51089</td></tr><tr><td>Indonesia</td><td>XL</td><td>MO</td><td>51008 or 51011</td></tr><tr><td>Cambodia</td><td>Smart Axiata</td><td>MT-MO</td><td>45605</td></tr><tr><td>Laos</td><td>Unitel</td><td>MT-MO</td><td>45703</td></tr><tr><td>Myanmar</td><td>ATOM</td><td>MT-MO</td><td>41406</td></tr><tr><td>Myanmar</td><td>Ooredoo</td><td>MT-MO</td><td>41405</td></tr><tr><td>Malaysia</td><td>Celcom</td><td>MT-MO</td><td>50213, 50219</td></tr><tr><td>Malaysia</td><td>Maxis</td><td>MO</td><td>50212 or 50217</td></tr><tr><td>Philippines</td><td>Smart/Sun</td><td>MT-MO</td><td>51503</td></tr><tr><td>Pakistan</td><td>Telenor Pakistan</td><td>MT-MO</td><td>52586</td></tr><tr><td>Singapore</td><td>M1</td><td>MT-MO</td><td>52503</td></tr><tr><td>Taiwan</td><td>Asia Pacific Telecom</td><td>N/A</td><td>46605</td></tr><tr><td>Taiwan</td><td>Chunghwa Telecom</td><td>N/A</td><td>46692, 46611</td></tr><tr><td>Taiwan</td><td>FarEasTone</td><td>N/A</td><td>46602, 46607, 46601, 46606, 46603</td></tr></tbody></table>

{% hint style="warning" %} <mark style="color:orange;">**Reference of USD Transactions**</mark>

Please check out this [guide ](/codapay/direct-api-integration/direct-api-integration-for-alternative-payment-methods/initiate-usd-transactions.md)to learn more about USD transactions.
{% endhint %}


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