# How to fund a Customer address via ONRAMP

#### ONRAMP — Cryptocurrency deposits via fiat payments

The ONRAMP service allows you to top up your customers' cryptocurrency addresses using fiat funds. Customers pay with a bank card or other available payment methods, and the selected cryptocurrency is credited to the specified address.

**How it works:**

* The customer selects the cryptocurrency and deposit amount
* Pays in fiat currency using a card or alternative payment method
* Cryptocurrency is deposited to the customer's address

**Features:**

* Buy cryptocurrency with a deposit to the specified address and payment in fiat
* Support for bank cards and other payment methods
* Direct cryptocurrency deposit to the customer's address
* Easy integration via API or widget

### Integration Requirements

To connect the service, the following preliminary steps must be completed:

**1. Customer service integration**\
You need to implement customer creation and management functionality. This ensures each user making transactions can be properly identified.

**2. Obtain customer cryptocurrency addresses**\
For each cryptocurrency you enable for deposits via ONRAMP, you must request and save the corresponding client address. These addresses will be used to credit the cryptocurrency after a successful fiat payment.

**3. Subscribe to transaction status webhooks**<br>

**⚠️ Important:** Customer addresses must be obtained in advance for all currencies that will be available for your users to purchase.<br>

### Process description

To accept fiat payments with deposit to customer address, follow these steps:<br>

{% stepper %}
{% step %}
**Create a customer -** [**Customer/Create**](https://docs.calypso.finance/api-reference/customer-purse-api#post-api-v1-customer-purse-customer-create)

* Register the user in the system to obtain a unique identifier for subsequent operations.
* [**How to create a Customer**](https://docs.calypso.finance/acquiring/customers/how-to-create-a-customer)
  {% endstep %}

{% step %}
**Obtain a deposit address for the customer -** [**Address/Get**](https://docs.calypso.finance/api-reference/customer-purse-api#post-api-v1-customer-purse-address-get)

* For the selected cryptocurrency, request the address where funds will be credited after successful payment.
* [**How to get a deposit address for a Сustomer**](https://docs.calypso.finance/acquiring/customers/how-to-get-a-deposit-address-for-a-sustomer)
  {% endstep %}

{% step %}
&#x20;**Use ONRAMP to accept fiat payment**

* Pass the payment information to the ONRAMP service: cryptocurrency, customer deposit address like **"external\_address"**
* [**How to create a payment via ONRAMP (API integration)**](https://docs.calypso.finance/acquiring/onramp-payments/how-to-create-a-payment-via-onramp)
* [**How to integrate the ONRAMP widget (API Widget integration)**](https://docs.calypso.finance/acquiring/onramp-widget/how-to-integrate-the-onramp-widget)
  {% endstep %}

{% step %}
**Receive webhook of deposit**

* After successful payment and conversion, you will receive a webhook notification that the cryptocurrency has been credited to the customer's address.
* [**How to process Customer transactions**](https://docs.calypso.finance/acquiring/customers/how-to-process-customer-transactions)
* [**Customer transaction events**](https://docs.calypso.finance/acquiring/customers/customers-webhooks)
  {% endstep %}
  {% endstepper %}