Create a SequenceConnect object and specify the Chain and Ecosystem you want to let users connect to. 
EcosystemType ecosystem = EcosystemType.Sequence;
SequenceConnect connect = new SequenceConnect(ecosystem);

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Try our Built-In Demo

Import the Ecosystem Wallet Demo sample from Unity’s Package Manager. Additionally, checkout our boilerplate script SequenceEcosystemWalletWindow for integration details.