# One Time

The available parameters are:

* **chain** *(string)* - chain used for the payment
* **description** *(string)* - payment's description
* **receivers** *(array)* - array of beneficiaries
* **amounts** *(array)* - array of amounts to send to the respective receivers
* **token** *(string)* - token symbol
* **category** *(string)* - category of the payment
* **tag** *(string)* - label used for identification or classification (*optional*)
* **callbackSuccess** *(string)* - redirect url after success (*optional*)
* **callbackError** *(string)* - redirect url after failure (*optional*)
* **webhook** *(string)* - url for server-side notification (*optional*)
* **extra** *(string)* - json object containing extra parameters that will be sent to webhook (*optional*)

The following data will be appended to the `callbackSuccess` url as query parameters:

* **user** *(string)* - address of the user who completed the payment
* **transactionHash** *(string)* - hash of the transaction

### **Example button**

```markup
<form action="https://checkout.8pay.network/" method="POST">
    <input type="hidden" name="type" value="one_time">
    <input type="hidden" name="chain" value="bsc">
    <input type="hidden" name="description" value="Ebook">
    <input type="hidden" name="token" value="8PAY">
    <input type="hidden" name="receivers[0]" value="0xe42fD8a58A82fDF624A8a94dA03a0e44F9934Dff">
    <input type="hidden" name="receivers[1]" value="0x5B848132d3a0111d4daB7060b6051961013C71c7">
    <input type="hidden" name="amounts[0]" value="5">
    <input type="hidden" name="amounts[1]" value="2">
    <input type="hidden" name="category" value="Shop">
    <input type="hidden" name="tag" value="ebook_859294">
    <input type="hidden" name="extra[banner]" value="BR69">
    <input type="hidden" name="extra[traffic]" value="facebook">
    <input type="hidden" name="callbackSuccess" value="https://www.google.com/">
    <input type="hidden" name="callbackError" value="https://www.google.com/">
    <input type="image" src="https://cdn.8pay.network/img/buttons/pay_in_crypto_blue.png" border="0" name="submit" alt="8PAY">
</form>
```