ANSWER:

It is totally prohibited to work in this project as it involves riba which is a major sin and your income would be haram as well as you are the one processing and facilitating this riba based process. 

Sheikh i am working in the project credit card process for the external client but i am not getting salary for them, i am getting salary from my organization which is having lots of halal projects i.e working for external client, i am receiving salary from my organization is that permissible or not ? please explain i am confused