> ## Documentation Index
> Fetch the complete documentation index at: https://sequence-0fb8d9e6-api_docs.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Migrate from a previous Major Version

## From v2 to v3

### Unreal Engine Version

Starting with v3, we are not supporting Unreal Engine 5.2 and 5.3 any longer. Please update to Unreal Engine 5.4 or later.

### SequenceWallet class

When you used the `SequenceWallet` (C++) or `SequenceWalletBP` (Blueprint) classes in 2.x.x, those referred to our Embedded Wallet Architecture.
If you’re using version 3, use the `SequenceEmbeddedWallet` (C++) and `SequenceEmbeddedWalletBP` (Blueprints) classes instead.
`SequenceWallet` classes now refer to our Ecosystem Wallet architecture.

### Large Numbers (BigInteger)

When defining values such as tokenId, amount, or chainId, they were previously referenced as `uint64`.
This imposed a limitation, because uint64 cannot represent the full range of `uint256` values used in blockchain interactions.

We have now replaced all BigInteger references with string types. Please update your code and Blueprints to reflect this change.

If you need to perform mathematical operations on BigIntegers, use our `FBigInt.h` class in C++.

## From v1 to v2

Sequence Unreal SDK v2 adds a lot structural improvements. Here is everything you need to know on how to migrate
from a previous 1.x.x version. If you have any questions or concerns, please reach out to us.

### Config file

* Add a `DefaultChain` variable to your `SequenceConfig.ini` file.
* Remove the `RedirectUrl` value. If you have specified a custom value, call `SequenceSdk::SetRedirectUrl` to change it.
  Alternatively, call the same function in the `SequenceSdkBP` subsystem for your Blueprint integration.

### Sign-In UI

We have removed support for the old Sign In Widget and its Pawn dependency.
If you have previously used the `BP_CustomSpectatorPawn`, `GM_Sequence` or any of the widgets, make sure to save your files in your project directory,
because the SDK no longer includes these files, and you will lose any changes you made.

* For an integrated Login UI, switch to our [Login Boilerplate](/sdk/unreal/bootstrap#login)
* Remove all references in your pawn that uses the `SequenceAuthenticator` and `SequenceBackendManager`.
* Make sure to exchange existing function calls to our Subsystems as mentioned in the next sections.

### Account Federation

We have removed separate functions for federation. Instead of calling `ConfirmEmailFederationWithCode` you call the
regular `ConfirmEmailLoginWithCode` node which will use the existing session to federate to.

### Blueprint Integration

Our Blueprint Subsystems have no separate event nodes anymore. Instead, they are included as function parameters.
You will see ‘OnSuccess’ and ‘OnFailure’ events in any async node such as ‘GetTokenBalances’. Please make sure to switch your existing nodes to the new structure.

Examples:

* Remove delegate assigners such as `Assign OnApiSendTransaction`
* Create event listeners directly from the `SendTransaction` node
* Switch Indexer calls like `GetTokenBalances` from `SequenceWalletBP` to `SequenceIndexerBP`

### C++ Integration

We renamed some of our classes for consistency. Please make sure to change your class references if you are using
any of the following.

* `UTransak` -> `USequencePay`
* `USequenceAuthenticator` -> `USequenceSessions`
* For Indexer calls: `USequenceWallet` -> `USequenceIndexer`