Virtual Account - Withdrawals from Master Exchange Address

There are two withdrawal methods from a Virtual Account:

• From a Virtual Account deposit address
• From a Master Exchange Address

Additional information is available at the following link.

Steps for Virtual Account asset withdrawal from Exchange Master Address

1. Store information about withdrawal
   • Check the id of the Virtual Account, the available balance or the UTXO balance
   • Decrease the amount and fees from the Virtual Account
   • Prepare transaction to broadcast transfer to the blockchain
2. Blockchain transfer
   • Standard blockchain transfer from address to address
   • Verify the result of the transfer
3. Complete/Rollback
   • IF blockchain transfer fails - rollback VA balance
   • ELSE complete withdrawal

Example:

1. User_A: VirtualAccount_A balance is 0 MATIC.
2. User_A: DepositAddress_A connected to VirtualAccount_A receives 3 MATIC.
   • VirtualAccount_A balance is now 3 MATIC.
3. Exchange_Owner: Transfers 3 MATIC from DepositAddress_A to MasterBlockchainAddress.
   • This is a standard Blockchain transfer via: Send MATIC from account to account
   • VirtualAccount_A balance remains 3 MATIC.
4. User_A: Withdraws and transfers 3 MATIC from VirtualAccount_A to VirtualAccount_B owned by User_B.
   • Endpoint: Send payment
   • VirtualAccount_A balance is now 0 MATIC.
   • VirtualAccount_B balance is now 3 MATIC.
5. User_B: Withdraws to transfer out 3 MATIC from VirtualAccount_B  to an unrelated blockchain address.
   1. Exchange_Owner: Store withdrawal --> /v3/offchain/withdrawal
   2. Exchange_Owner: Standard blockchain transfer via: Send MATIC from account to account
   3. Exchange_Owner: Completes or Cancels the withdrawal
      1. Complete withdrawal --> /v3/offchain/withdrawal/{id}/{txId}
      2. Cancel withdrawal --> /v3/offchain/withdrawal/{id}