add trait

crates/cdk-integration-tests/tests/fake_auth.rs

@@ -16,6 +16,7 @@ use cdk::wallet::{AuthHttpClient, AuthMintConnector, HttpClient, MintConnector,
 use cdk::{Error, OidcClient};
 use cdk_fake_wallet::create_fake_invoice;
 use cdk_http_client::HttpClient as CommonHttpClient;
+use cdk_http_client::RequestBuilderExt;
 use cdk_integration_tests::fund_wallet;
 use cdk_sqlite::wallet::memory;