Off Ramp Hiding Receiving Address Page

Explanation:

Through this integration method, it is possible to hide the deposit address page, but it requires a successful ACH deposit notification. Please refer to the following diagram for the process:

Note: Currently, only the following cryptocurrencies are supported for this feature.

crypto	network
USDC	BSC
USDT	BSC
ETH	ETH
USDC	ETH
USDT	ETH
MATIC	MATIC
USDC	MATIC
USDT	MATIC
USDC	TRX
USDT	TRX

Request Parameters

Parameter	Description	Required
appId	Merchant application ID, eg:ahzxh0klegv1fzol	Y
crypto	Cryptocurrency name, eg:USDT	Y
network	Network, eg:ETH	Y
cryptoAmount	Sold cryptocurrency amount	Y
fiat	Fiat currency code, eg:USD	Y
country	Country code, eg:US	Y
callbackUrl	Callback URL for synchronizing order information with the merchant	Y
withdrawUrl	URL to redirect back to the merchant	Y
source	Source. Default: 3. Uploading this field will hide the deposit address page	Y
type	Type, eg:sell	Y
merchantOrderNo	Merchant's custom order number, eg:1112957819622420480	Y
showAddress	Whether to display the address QR code. Optional: Y/N	Y
merchantName	Merchant name	Y
urlType	Can only be "app" or "web",representing the type of withdrawUrl the user will be redirected to	Y

🚧

Note: If the source parameter is passed, the URL should be appended with #/sell-formUserInfo. This will directly navigate to the bank information filling page without a back button and menu bar. If not passed, it will directly enter the sell coin homepage.

As shown in the following diagram:

Request example:

HTTP

https://ramp.alchemypay.org?appId=ahzxh0klegv1fzol&crypto=ELF&network=ELF&fiat=USD&country=US&cryptoAmount=100&callbackUrl=https://localhost:9090/test/test&withdrawUrl=www.baidu.com&type=sell&source=3&urlType=web&merchantName=AELF&merchantOrderNo=2134545343544334&showAddress=N#/sell-formUserInfo

Notification parameters

ACH notification

After the user submits the form, an order will be generated, and the order information will be pushed through the callbackUrl in the merchant's request parameters. Order information will be pushed for every change in order status.

Push parameters:

Parameter	Description	Required
orderNo	Order number	Y
merchantOrderNo	Merchant order number	N
crypto	Cryptocurrency	Y
network	Network	Y
cryptoPrice	Cryptocurrency price	N
cryptoAmount	Cryptocurrency quantity	Y
fiatAmount	Fiat currency quantity	N
appId	Merchant appId	Y
fiat	Fiat currency code	Y
txHash	Transaction hash	N
email	User email	N
status	Order status: 1: Order created successfully, 2: User coin deposit completed, 3: Start payment, 4: Payment successful, 5: Payment failed, 6: Refund successful, 7: Order timeout	Y
address	Coin deposit address	Y
cryptoActualAmount	Actual coin deposit quantity	N
rampFee	Service fee	N
receiptTime	Payment completed	N
paymentType	Payment method	Y
name	User name	Y
card	Card number	N
account	Account	N
orderAddress	Order details page URL	Y
signature	Signature, refer to "Notification Signature Method" below	Y

Merchant notification

After the user completes the coin deposit, the merchant needs to push information to ACH.

Request

Path: https://api.alchemypay.org/webhooks/off/merchant

• post
• application/json

📘

IP whitelist configuration is required and can be added in the merchant backend.

Push parameters:

Parameter	Description	Required
orderNo	Order number	Y
crypto	Cryptocurrency	Y
cryptoAmount	Cryptocurrency quantity	Y
network	Network	Y
txHash	Transfer hash	Y
address	ACH notification, the "address" in the parameters.	Y
appId	"Merchant appId"	Y
signature	Signature, refer to "Notification Signature Method" below	Y

Push example：

JSON

{
    "orderNo": "string",
    "crypto": "string",
    "cryptoAmount": "string",
    "txHash": "string",
    "network": "string",
    "address": "string",
    "appId": "string",
    "sourceAddress": "string",
    "signature": "string"
}

Response

Response parameters：

Parameter	Description	Required
success	boolean	Y
returnCode	string
returnMsg	string	Y
extend	string
data	object	Y

Response example：

JSON

{
    "success": true,
    "returnCode": "string",
    "returnMsg": "string",
    "extend": "string",
    "data": {}
}

Notification Signature Method

Concatenated parameters: appId+appSecret+orderNo+crypto+network+address

Java

public class MerSignCheckUtil {

    private static final char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5',
        '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

 

    private static String encode(String algorithm, String value) {
        if (value == null) {
            return null;
        }
        try {
            MessageDigest messageDigest= MessageDigest.getInstance(algorithm);
            messageDigest.update(value.getBytes());
            return getFormattedText(messageDigest.digest());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    private static String getFormattedText(byte[] bytes) {
        int len = bytes.length;
        StringBuilder buf = new StringBuilder(len * 2);
        for (int j = 0; j < len; j++) {
            buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]);
            buf.append(HEX_DIGITS[bytes[j] & 0x0f]);
        }
        return buf.toString();
    }

    public static void main(String[] args) {
          String appId = "";
          String appSecret = "";
          String crypto = "";
          String orderNo = "";
          String network = "";
          String address = "";
          String rawString = appId + appSecret + orderNo + crypto + network + address;
          String sign = encode("sha1", rawString);
    }

}