payment_step_one

{
    "course_type": "course", // choice is "course" or "course_bundle"
    "course_slug": "toeic_buffet",
    "promotion_code": "50PERCENT",
    "student_info": {
        "first_name": "due",
        "last_name": "droid",
        "email_contact": "due@droid.com",
        "tel_contact": "0932476787",
        "address_street": "1/1 Donmueang",
        "address_province": 10,
        "address_zipcode": 10210
    },
    "invoice": {
        "tax_name": "due droid",
        "tax_code": "12345678",
        "tax_address": "1/1 Donmueang Bangkok",
        "tax_address_delivery": 1,
        "tax_address_zipcode": 10210
    }
}