I am sorry because i haven't found any answer for my question. So i created one from here.
My problem :
CloudSign API that i am using : https://app.swaggerhub.com/apis/CloudSign/cloudsign-web_api/0.10.4#/default/post_documents__documentID__files
This is list solution that i tried and failure :
- Using fetch : CORS error
I'm really appreciate if somebody have experience with this helped me.