通过删除硬编码的Gmail凭据来获取谷歌联系人使用Gdata授权

The idea is to login through gmail and get all contacts details and also add a contact from PHP code to google contact list. The whole flow is working well and i am getting contact list and also adding contacts with fields. The problem is that the code has hardcoded variables where i need to set google email and password.I want to have a link to authoriZe and then get all response.. So i just need to bypass the credentials on first attempt using an API or token method and get the contact detailsThe idea is to login through gmail and get all