Onramp API Integration.

Web hook - Onramp

5min

This section explains the steps to configure callback URLs for receiving events about the completed transaction.
Configuring Webhook
Webhooks are configured in merchant dashboard.
Inside API Setup section, webhook can be added and modified under Callback URL's section.
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Generating HMAC
Signature is computed using Hash-based message authentication code (HMAC) using a secret key. The secret key is the API Secret present in your merchant dashboard.

The example implementation in Nodejs is show below ⬇️
Node.js
let hmac = crypto.createHmac('sha256', apiSecret);
hmac.update(JSON.stringify(postBody));
let hash = hmac.digest('hex');
assert(hash == headers["X-Onmeta-Signature"])
let hmac = crypto.createHmac('sha256', apiSecret);
hmac.update(JSON.stringify(postBody));
let hash = hmac.digest('hex');
assert(hash == headers["X-Onmeta-Signature"])
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This callback will be triggered when the crypto coins are deposited to the given receiver address. will use the configured webhook url to send order completed details in POST body.
POST
Request
Header Parameters
Content-Type	
String
optional
application/json; charset=utf-8
X-Onmeta-Signature
String
required
{{signature-of-the-request}} as computed above.
Body Parameters
fiat
String
required
fiat amount 
receiverWalletAddress
String
required
receiver Wallet address
buyTokenSymbol
String
required
token symbol ex: BTC/USDC
buyTokenAddress
String
required
smart contract of the token example : "0x9c3C9283D3e44854697Cd22D3Faa240Cfb032889" for WMATIC
orderId
String
required
order ID - unique for a given ID
status
String
required
order status : "completed"
currency
String
required
currency type example: "inr"
chainId
Number
required
block chain ID : example: "80001" for polygon testnet
customer
Object
required
txnHash
String
required
transaction hash for completed order.
transferredAmount
String
required
quantity of crypto tokens transferred
transferredAmountWei
String
required
transferredAmount in Gwei
createdAt
String
required
created time
eventType
String
required
onramp/offramp
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eventType will be onramp for this order  
Make sure you have firewall rule allowed for receiving the webhook body if not your firewall might block our webhook requests.
Sample body 

JS
{
  "fiat":100,
  "receiverWalletAddress":"0x14o2422324232323232323232232",
  "buyTokenSymbol":"MATIC",
  "buyTokenAddress":"0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee",
  "orderId":"63c93f0ffa666e128b7ab131",
  "status":"completed",
  "currency":"INR",
  "chainId":80001,
  "customer":{
    "id":"63aaedf35b07a87b1f912023",
    "email":"[email protected]",
    "phone":{
    },
    "created_at":"2022-12-27T13:06:59.068Z"
  },
  "createdAt":"2023-01-19T13:01:03.289Z",
  "txnHash":"0xae21ff484bd2d05d22f6....7d1f795e9e09cda97b4d522",
  "transferredAmount":"0.01",
  "transferredAmountWei":"10000000000000000",
  "eventType":"onramp",
  "metaData" :  "metaData": {
      "conversionRate": "90.2",
      "commission": "0"
    }
}
{
  "fiat":100,
  "receiverWalletAddress":"0x14o2422324232323232323232232",
  "buyTokenSymbol":"MATIC",
  "buyTokenAddress":"0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee",
  "orderId":"63c93f0ffa666e128b7ab131",
  "status":"completed",
  "currency":"INR",
  "chainId":80001,
  "customer":{
    "id":"63aaedf35b07a87b1f912023",
    "email":"test@test.com",
    "phone":{
    },
    "created_at":"2022-12-27T13:06:59.068Z"
  },
  "createdAt":"2023-01-19T13:01:03.289Z",
  "txnHash":"0xae21ff484bd2d05d22f6....7d1f795e9e09cda97b4d522",
  "transferredAmount":"0.01",
  "transferredAmountWei":"10000000000000000",
  "eventType":"onramp",
  "metaData" :  "metaData": {
      "conversionRate": "90.2",
      "commission": "0"
    }
}
﻿
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transferredAmount and transferredAmountWei will be sent in fiatPending and completed state
conversionRate and commission is sent inside the metaData along with user-set metaData (if any) in the completed state
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Webhook Events
Onramp Webhook Events 
Onmeta provides six types of webhook events that allow you to receive real-time notifications when specific events occur during the onramp flow.
#
EventName
Description
1
fiatPending
This event is triggered when a user has initialised an order but fiat deposit from user is pending.
2
orderReceived
This event is triggered when a user completes payment and Onmeta has initiated the crypto transfer.
3
InProgress (optional)
This event is triggered when the order is in-progress on the blockchain.
4
fiatReceived
This event is received on confirming that Onmeta has received payment for the onramp order.
5
transferred
This event is triggered when a user's token transfer is confirmed on the blockchain.
6
completed
This event is triggered when a user's order is completed and the user has received the tokens.
7
expired
When an order remains pending for more than three hours, the order is expired and this webhook event is triggered.
Note : Optional events will occur when using non-native tokens
Example Webhook Request :
JSON
  {   
    "fiat":100,
    "receiverWalletAddress":"0xF12dc1E2EEb4d0475DE270447A92a481635caF4a",   "buyTokenSymbol":"MATIC",
    "buyTokenAddress":"0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee",
    "orderId":"641c30286ad7d01834a02e2c",  
    "status":"fiatPending",
    "currency":"INR",
    "chainId":137,
    "customer":{"id":"web52390easf35fas2a25d3fffwsdae",
    "email":"[email protected]",
    "phone":{},
    "created_at":"2023-01-04T06:58:24.968Z"},
    "createdAt":"2023-03-23T10:55:36.584Z",
    "txnHash":"",
    "transferredAmount":"0.990628",
    "transferredAmountWei":"990628498656169300",
    "eventType":"onramp",
    "metaData":{"submeta1":"metadata"}
  }
  {   
    "fiat":100,
    "receiverWalletAddress":"0xF12dc1E2EEb4d0475DE270447A92a481635caF4a",   "buyTokenSymbol":"MATIC",
    "buyTokenAddress":"0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee",
    "orderId":"641c30286ad7d01834a02e2c",  
    "status":"fiatPending",
    "currency":"INR",
    "chainId":137,
    "customer":{"id":"web52390easf35fas2a25d3fffwsdae",
    "email":"documentation@onmeta.in",
    "phone":{},
    "created_at":"2023-01-04T06:58:24.968Z"},
    "createdAt":"2023-03-23T10:55:36.584Z",
    "txnHash":"",
    "transferredAmount":"0.990628",
    "transferredAmountWei":"990628498656169300",
    "eventType":"onramp",
    "metaData":{"submeta1":"metadata"}
  }
﻿
﻿
﻿

#	EventName	Description
1	fiatPending	This event is triggered when a user has initialised an order but fiat deposit from user is pending.
2	orderReceived	This event is triggered when a user completes payment and Onmeta has initiated the crypto transfer.
3	InProgress (optional)	This event is triggered when the order is in-progress on the blockchain.
4	fiatReceived	This event is received on confirming that Onmeta has received payment for the onramp order.
5	transferred	This event is triggered when a user's token transfer is confirmed on the blockchain.
6	completed	This event is triggered when a user's order is completed and the user has received the tokens.
7	expired	When an order remains pending for more than three hours, the order is expired and this webhook event is triggered.

Supported Currencies

Sample responses