> For the complete documentation index, see [llms.txt](https://startbutton.gitbook.io/startbutton-product-api/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://startbutton.gitbook.io/startbutton-product-api/sdk/sdk/sbinit-function.md). # SBInit Function ## Description The `SBInit` function is used to initialize a payment process using the specified parameters. ## SBInit Function Example (HTML) 
<!DOCTYPE html>
<html lang="en">
<head>
  <script defer src="https://checkout.startbutton.tech/version/latest/sb-web-sdk.min.js"></script>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>

<button onclick="runSdk()">Trigger SDK</button>

<script>

  function runSdk() {
    SBInit({
      phone: '080123456789',
      key: 'sb_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
      amount: 564300,
      channels: ['card'],
      env: 'test',
      success: (res) => {
        console.log(res)
      },
      close: () => {
        console.log('closed')
      },
      error: (res) => {
        console.log(res)
      },
      currency: 'NGN',
      email: 'talktotester@gmail.com',
      metadata: {
        itemId: 'HTY9898999UI'
      }
    })
  }
</script>

</body>
</html>
## Parameters | Parameter | Desc | Type | Accepted Values | | --------- | --------------------------------------------------------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | phone | Phone number of the merchant. | String | - | | key | Merchant public key for authentication | String | Your public API key | | amount | Amount of the payment | Number | Amount to charge in fractional units (e.g., 1000 = ₦10 | | channels | Payment channels to be used. for accepted value please refer to | String | [Payment Methods](https://startbutton.gitbook.io/startbutton-product-api/startbutton-api-doc/accept-payments#specify-payment-method) | | success | Callback function for successful payment. | Function | - | | error | Callback function for error handling. | Function | - | | close | Callback function when payment modal is closed. | Function | - | | currency | Currency of the payment. accepted values. | String |

Transaction currency (e.g., NGN, GHS).

See here for supported currencies

| | email | Email of the payer. | String | | | metadata | Additional information that you may need for further processing | Object | - | ## Documentation For more information please check out our [documentation](https://startbutton.gitbook.io/startbutton-product-api/startbutton-api-doc)