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Coinbase Wallet Mobile SDK uses Universal Links to communicate between Coinbase Wallet and your application.

Before the SDK can be used, it needs to be configured with a Universal Link to your application. This callback URL will be used by the Coinbase Wallet application to navigate back to your application.

    callback: URL(string: "")!

When your application receives a response from Coinbase Wallet via a Universal Link, this URL needs to be handed off to the SDK via the handleResponse function.

func application(_ app: UIApplication, open url: URL ...) -> Bool {
    if (try? CoinbaseWalletSDK.shared.handleResponse(url)) == true {
        return true
    // handle other types of deep links
    return false

It’s recommended to place this configuration logic in the AppDelegate as shown in this example.