# Payment Flow

Note: `l2Txnhash` (the "L2-hash") should always be used as the unique identifier of a transaction. This is a unique transaction-hash for any transaction on [AkashicChain](/introduction/terminology.md#akashicchain). It is present for Confirmed deposits and Pending/Confirmed payouts. This is particularly important for the case of [Layer 2](/introduction/terminology.md#layer-2) transactions, which will not have a Layer 1 hash (`txHash`)

## <mark style="color:blue;">Deposit Flow</mark>

{% @mermaid/diagram content="sequenceDiagram
autonumber
Server->>Akashic: getDepositAddress<br/>to retrieve permanent L1 address for client<br/>using unique client identifier
Akashic-->>Server: permanent L1 address
Server->>client: permanent L1 address
loop
client->>L1/L2 network: deposit to address
Akashic->>Server: pending deposit callback<br/>with identifier and txHash
Akashic->>Server: confirm deposit callback<br/>with identifier and l2TxnHash/txHash
note over Server: \*Recommended<br/>credit client balance
end
" %}

## <mark style="color:blue;">Payout Flow</mark>

{% @mermaid/diagram content="sequenceDiagram
autonumber
Server->>Akashic: payout with unique client identifier
Akashic-->>Server: Success
note over Server: \*Recommended<br/>debit client balance
Akashic->>L1/L2 network: payout
Akashic->>Server: pending payout callback<br/>with identifier and txHash
Akashic->>Server: confirm payout callback<br/>with identifier and l2TxnHash/txHash
" %}


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