Recharge & Withdrawal Quick Start

Process Overview

Recharge Process

Withdrawal Process

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Recharge Process Details

1. Overview

Recharge: Merchants generate an exclusive recharge address for users by calling APIs. Address generation involves two steps: first create a sub-contract address (uuid), then call the query API to get the actual recharge address. After users transfer funds to this address, the Coinbac system automatically confirms receipt and sends a callback to the merchant. Finally, merchants can obtain recharge details through the query API.

Process:

👉 Merchant calls createUserWallet → Get uuid → Call getUserWalletDetail → Get recharge address → User transfer → Coinbac callback rechargeCallback → Merchant confirmation → Call getRechargeDetail to query recharge details.

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2. Prerequisites

• Create merchant account: Sandbox Registration

• Get API Key / Secret: Get API Key / Secret

• Confirm the network to use:

  • Sandbox environment: https://api-sandbox.coinbac.vip/api/mer
  • Production environment: https://api.coinbac.vip/api/mer

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3. API Signature Authentication

All requests need to add signature parameters in the Header:

Header	Description
X-PAY-KEY	Merchant API Key
X-PAY-TIMESTAMP	Current Unix timestamp (in seconds, error ≤ 60 seconds)
X-PAY-SIGN	Signature, refer to Signature Rules

The signature rules are consistent with the payment process:

signString = timestamp + method + requestPath + body
sign = Base64( HMAC_SHA256(apiSecret, signString) )

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4. Create Sub-contract Address (createUserWallet)

createUserWallet API Documentation

Request Example

POST /api/mer/user/create
Host: api-sandbox.coinbac.vip
Content-Type: application/json
X-PAY-KEY: <your_api_key>
X-PAY-TIMESTAMP: 1723971200
X-PAY-SIGN: <generated_signature>

Request Body Example

{
  "uuid": "USER10001"
}

Response Example

{
  "code": 200,
  "msg": "Success",
  "data": 7046
}

5. Query Sub-contract Address (getUserWalletDetail)

getUserWalletDetail API Documentation

Request Example

GET /api/mer/user/detail?uuid=USER10001
Host: api-sandbox.coinbac.vip

Response Example

{
  "code": 200,
  "msg": "Success",
  "data": {
    "userId": 7046,
    "createTime": "2025-06-23 14:18:58",
    "userWallet": [
      {
        "walletId": 65953,
        "chainId": 136,
        "walletAddress": "THwGn3FcboiwbaJmLqXTkXapWryegchc3v"
      }
    ],
    "userType": 0,
    "uuid": "USER10001"
  }
}

The walletAddress is now the user's exclusive recharge address.

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6. User Recharge

Merchants provide the generated walletAddress to users, who then recharge funds to this address.

• Users can use exchange wallets or decentralized wallets (such as TronLink, MetaMask) to transfer funds
• The system will automatically trigger a callback after detecting the deposit

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7. Recharge Callback (rechargeCallback)

After the user's recharge is confirmed, Coinbac will automatically call the merchant's configured callback URL (POST request).

rechargeCallback API Documentation

Callback Example

{
  "rechargeId": 1017,
  "chainId": 136,
  "currencyId": 107,
  "userId": 5923,
  "walletId": 62928,
  "walletAddress": "THwGn3FcboiwbaJmLqXTkXapWryegchc3v",
  "rechargeStatus": 0,
  "rechargeAmount": "10000000",
  "transferHash": "35e5e3dab41b43e9727a21b69f07a330af34c86673fb931e2f7a61ca871b7d27",
  "fromAddress": "TGrw6GPAPrtRR7ivdzJR8WyqdA3dy6XnqJ",
  "blockTime": "2025-06-24 07:06:30",
  "createTime": "2025-06-24 15:06:41",
  "uuid": "10"
}

Merchants need to:

1. Verify signature sign
2. Update order status
3. Return HTTP 200 to indicate success

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8. Configure Recharge Callback URL

Merchants need to configure the recharge callback URL in Coinbac admin console → Organization Information page. This URL must be publicly accessible with HTTPS protocol, otherwise callback notifications cannot be received normally.

Steps:

1. Login to merchant backend
2. Go to Organization in the top navigation
3. Click Edit
4. Fill in your callback URL in "Recharge Callback URL" field (must be HTTPS)

Illustration:

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9. Query Recharge Order (getRechargeDetail)

getRechargeDetail API Documentation

Request Example

GET /api/mer/recharge/detail?rechargeId=1017
Host: api-sandbox.coinbac.vip

Response Example

{
  "code": 200,
  "msg": "Success",
  "data": {
    "rechargeId": 1017,
    "chainId": 136,
    "currencyId": 107,
    "userId": 5923,
    "walletId": 62928,
    "walletAddress": "THwGn3FcboiwbaJmLqXTkXapWryegchc3v",
    "rechargeStatus": 0,
    "rechargeAmount": "10000000",
    "transferHash": "35e5e3dab41b43e9727a21b69f07a330af34c86673fb931e2f7a61ca871b7d27",
    "fromAddress": "TGrw6GPAPrtRR7ivdzJR8WyqdA3dy6XnqJ",
    "blockTime": "2025-06-24 07:06:30",
    "createTime": "2025-06-24 15:06:41",
    "uuid": "10"
  }
}

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✅ Congratulations! You have completed the complete recharge process:

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Withdrawal Process Details

1. Overview

Withdrawal: Merchants initiate withdrawal requests through APIs. After admin approval, the system transfers funds from the merchant's contract or wallet address to the specified withdrawal address.

Process:

👉 Merchant calls withdrawApply → Get withdrawId → Admin approval → Coinbac callback withdrawCallback → Merchant confirmation → Call getWithdrawDetail to query withdrawal details.

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2. Apply for Withdrawal (withdrawApply)

withdrawApply API Documentation

Request Example

POST /api/mer/withdraw/apply
Host: api-sandbox.coinbac.vip
Content-Type: application/json
X-PAY-KEY: <your_api_key>
X-PAY-TIMESTAMP: 1723971200
X-PAY-SIGN: <generated_signature>

Request Body Example

{
  "chainId": 1,
  "currencyId": 1,
  "withdrawAddress": "TWgjEv2SKVxFZM6n1o1uDSi1kPxsYEZkFd",
  "withdrawAmount": "3.5",
  "outTradeNo": "202404191100",
  "notifyUrl": "https://api.mer.com/withdraw/202404191100"
}

Response Example

{
  "code": 200,
  "msg": "success",
  "data": {
    "withdrawId": 35
  }
}

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3. Admin Approval

After the merchant initiates a withdrawal request, it needs to be approved through the Coinbac admin console:

1. Login to merchant backend
2. Go to withdrawal management page
3. Select pending withdrawal orders
4. Confirm approval

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4. Withdrawal Callback (withdrawCallback)

After the withdrawal is approved and transferred, the Coinbac system will automatically call the merchant's configured callback URL (POST request).

withdrawCallback API Documentation

Callback Example

{
  "withdrawId": 35,
  "chainId": 1,
  "currencyId": 1,
  "withdrawAddress": "TWgjEv2SKVxFZM6n1o1uDSi1kPxsYEZkFd",
  "withdrawAmount": "35000000",
  "withdrawStatus": 0,
  "transferHash": "35e5e3dab41b43e9727a21b69f07a330af34c86673fb931e2f7a61ca871b7d27",
  "outTradeNo": "202404191100"
}

Merchant needs to:

1. Verify the signature
2. Update order status
3. Return HTTP 200 to indicate success

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5. Query Withdrawal Order (getWithdrawDetail)

getWithdrawDetail API Documentation

Request Example

GET /api/mer/withdraw/detail?withdrawId=35
Host: api-sandbox.coinbac.vip

Response Example

{
  "code": 200,
  "msg": "success",
  "data": {
    "withdrawId": 35,
    "chainId": 1,
    "currencyId": 1,
    "withdrawAddress": "TWgjEv2SKVxFZM6n1o1uDSi1kPxsYEZkFd",
    "withdrawAmount": "35000000",
    "withdrawStatus": 0,
    "transferHash": "35e5e3dab41b43e9727a21b69f07a330af34c86673fb931e2f7a61ca871b7d27",
    "outTradeNo": "202404191100",
    "withdrawTime": "2024-04-19 11:00:00"
  }
}

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✅ Congratulations! You have completed the complete withdrawal process: