# Initiate a transaction Once you're all set, you're ready to let your customers buy crypto with us. ## Redirect the customer The first step is to redirect your customer to our platform using a special URL: - ![$Production] ```shell https://ramp.revolut.com/? ``` - ![$Test environment] ```shell https://ramp.revolut.codes/? ``` This URL consists of the Revolut Ramp platform address followed by a list of different key-value parameters, which you can set before you redirect the customer to us. The parameters list follows `?`, and multiple parameters are separated by `&`, like this: ``` =&= ``` What is more, you can decide whether to let the customer modify these parameters after redirection or not. An example URL looks like this: - ![$Production] ```shell https://ramp.revolut.com/?amount=700&fiatCurrency=EUR&walletAddress=0xc1912fee45d61c87cc5ea59dae31190fffff232d&partnerId=fb48770a-51b0-402e-8d25-33474f474aa2 ``` - ![$Test environment] ```shell https://ramp.revolut.codes/?amount=700&fiatCurrency=EUR&walletAddress=0xc1912fee45d61c87cc5ea59dae31190fffff232d&partnerId=fb48770a-51b0-402e-8d25-33474f474aa2 ``` ### Configurable parameters These are the parameters that you can configure and include in the Revolut Ramp Redirect URL: | Parameter | Description | Example | JSON type | | -------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------- | ---------------- | | `amount` | Default fiat amount that is pre-filled for the user. Provided in *minor currency* (`amount=10&fiatCurrency=EUR` means `€0.10`). | `amount=1000`, `amount=1250` | number($integer) | | `fiatCurrency` | [ISO 4217](https://en.wikipedia.org/wiki/ISO_4217) code of the default fiat currency. Defaults to `GBP`. | `fiatCurrency=EUR` | string | | `cryptoCurrency` | Default crypto currency [symbol](https://en.wikipedia.org/wiki/List_of_cryptocurrencies). Defaults to `ETH`. | `cryptoCurrency=BTC` | string | | `countryCode` | [ISO 3166 Alpha-2](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2) code of the country | `countryCode=GB` | string | | `walletAddress` | Default wallet address | `walletAddress=`
`0xc1912fee45d61c87cc5ea59dae31190fffff232d` | string | | `partnerId` | Partner ID. It allows us to distinguish transactions from a particular Partner. It is useful, for example, for customer support or financial settlements with Partners. | `partnerId=fb48770a-51b0-402e-8d25-33474f474aa1` | string | | `externalOrderId` | External order ID. May be provided by the Partner on order creation via the `ramp_redirect_url` that redirects the customer to Revolut Ramp. It allows the Partner to fetch an order from the Revolut Ramp database based on this ID using the `/orders/{order_id}` endpoint. Must match following regular expression:
`^(?:[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12})\|(?:[0-9a-zA-Z]{26})$` | `externalOrderId=a01868cc-71ab-d2ed-a10b-0a32ac1c0b02` | string($regexp) | | `partnerRedirectUrl` | Success Redirect URL. If provided, the customer is redirected to this URL upon successful order creation. Otherwise, the customer is taken to the transaction details on Revolut Ramp. | `partnerRedirectUrl=https://example.com` | string($uri) | #### Input Control Parameters On top of the parameters above, you can also decide to disable input for certain parameters. This is useful when you want to pre-configure these parameters and don't want the customer to modify them. These are the disable options that you can use: :::warning If you disable a certain parameter but then don't provide a pre-configured value for it, the setting is overridden and the parameter is not disabled. ::: | Parameter | Description | Example usage | JSON type | | ----------------------- | ----------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------- | --------- | | `disableFiatAmount` | Disable the Fiat amount input.
If `amount` is not provided, this is overridden with `false`.
Defaults to `false`. | `disableFiatAmount=true` | boolean | | `disableCountryCode` | Disable the Country code selection input.
If `countryCode` is not provided, this is overridden with `false`.
Defaults to `false`. | `disableCountryCode=true` | boolean | | `disableWalletAddress` | Disable the Wallet address input.
If `walletAddress` is not provided, this is overridden with `false`.
Defaults to `false`. | `disableWalletAddress=true` | boolean | | `disableCryptoCurrency` | Disable Crypto currency selection. | `disableCryptoCurrency=true` | boolean | ## What's next Once you redirect the user to Revolut Ramp, they go through order creation on our portal. For more details, see the [order creation from customer's perspective](customer-perspective.md). ## Related links - [Get a Revolut Ramp Redirect URL using the Crypto Ramp API](../tutorials/use-the-api.md#get-a-revolut-ramp-redirect-url)