public void addScope(WechatScope scopes) {
        if (this.scopes == null)
            this.scopes = new ArrayList<>();
        this.scopes.add(scopes);
    }
<p>addScope.</p>

@param scopes a {@link WechatClient.WechatScope} object
pac4j-oauth/src/main/java/org/pac4j/oauth/client/WechatClient.java