Introduction:

Before integrate Off Ramp Hiding Receiving Address Page, please contact technical support team for configuration.

This function allows merchant send crypto to ACH for selling and user enter bank information for fund received on ACH page.
Needs to send the exact crypto amount specified in the order. Please take the network fee into consideration. We recommend setting a limit on the decimal precision to avoid withdrawal failures caused by minor differences.
User is required enter email address and login on Alchemy Pay page.
Provide all sever IP for whitelist.Any changes must be reported to ACH in advance.
After transfer crypto, please send notification to Alchemy Pay.

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:

Supported Token List

Note: Only support the following cryptocurrencies 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

API Description

Merchant Create Order - Request Parameters

Parameter	Required	Description
appId	Y	Merchant application ID, eg:ahzxh0klegv1fzol
timestamp	Y	Thirteen-digit timestamp
sign	Y	For the generation rules of the sign, please refer to this Click Here .URL encoding is required when concatenating to the request URL.
crypto	Y	Cryptocurrency name, eg:USDT
network	Y	Network, eg:ETH
cryptoAmount	Y	Sold cryptocurrency amount
fiat	Y	Fiat currency code, eg:USD
country	Y	Follow the ISO 3166-1 alpha-2 standard. The country code corresponding to the fiat currency. Example: fiat: EUR → country: DE fiat: USD → country: US
callbackUrl	Y	Callback URL for synchronizing order information with the merchant
withdrawUrl	Y	URL to redirect back to the merchant after user click "Confirm"
source	Y	Source. Default: 3. Uploading this field will hide the deposit address page
type	Y	Type, eg:`sell`
merchantOrderNo	Y	Merchant's custom order number, eg:1112957819622420480
showAddress	Y	Whether to display the address QR code. Optional: Y/N
merchantName	Y	Merchant name
urlType	Y	Can only be "app" or "web",representing the type of withdrawUrl the user will be redirected to

📘
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.

Bank Information Filling Page:

Request Example:

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

ACH Send Order Status Webhook

ACH will send order webhook to callbackUrl after an order generate. Webhook will send when order status updated.

Path: callbackUrl

Body Parameters:

Parameter	Required	Description
orderNo	Y	Order number
merchantOrderNo	N	Merchant order number
crypto	Y	Cryptocurrency
network	Y	Network
cryptoPrice	N	Cryptocurrency price
cryptoAmount	Y	Cryptocurrency quantity
fiatAmount	N	Fiat currency quantity
appId	Y	Merchant appId
fiat	Y	Fiat currency code
txHash	N	Transaction hash
email	N	User email
status	Y	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
address	Y	Coin deposit address
cryptoActualAmount	N	Actual coin deposit quantity
rampFee	N	Service fee
receiptTime	N	Payment completed
paymentType	Y	Payment method
name	Y	User name
card	N	Card number
account	N	Account
orderAddress	Y	Order details page URL
signature	Y	Signature, refer to "Notification Signature Method" below

Merchant Notification to ACH

Merchant send notification to ACH after user complete crypto deposit process.

Request Method: POST

Content Type: application/json

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

Request Parameters

Body Parameters:

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

Request Parameter Example：

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

Response Parameters

Body Parameters:

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

Response Example：

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

Notification Signature Method

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

Note
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);
    }

}

Note

Merchants can whitelist their Egress IP (for sending notifications to ACH) in the merchant dashboard, as shown in the screenshot below.