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. 
CoinbaseWalletSDK.configure(
    callback: URL(string: "https://myappxyz.com/mycallback")!
)
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.