> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mls.onchainden.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Transaction Flow

> Step-by-step flow for transaction approval and execution.

1. **A Member queues a transaction via web or SDK**

   Transactions can be initiated through the web dashboard or programmatically via the [API & SDK](/core-concepts/api-sdk). If the transaction does not match any policies, the Member will be unable to queue the transaction.

2. **Required approvals are collected**

   If the transaction is governed by a policy that requires manual approval by a Member or Group, those approvals must be provided.

   * **Web workflow**: Members approve in the web application, then sign the transaction on their mobile wallet. The mobile wallet independently runs the policy engine to verify the transaction before allowing the signature.
   * **SDK workflow**: Members approve programmatically via the SDK. The SDK independently runs the policy engine to verify the transaction before approval.

3. **The transaction is executed via web or SDK**

   Once all approvals are collected, the transaction initiator or any reviewer can execute the transaction via the web application or SDK.

   The off-chain Guardian Service independently runs the policy engine to verify the transaction. If valid, it submits the transaction to the on-chain Smart Contracts, which also run the policy engine on-chain before executing.