affirm.checkout({ "merchant": { "user_confirmation_url": "https://merchantsite.com/confirm", "user_cancel_url": "https://merchantsite.com/cancel", "user_confirmation_url_action": "POST", "name": "Your Customer-Facing Merchant Name" }, "shipping":{ "name":{ "first":"Joe", "last":"Doe" }, "address":{ "line1":"633 Folsom St", "line2":"Floor 7", "city":"San Francisco", "state":"CA", "zipcode":"94107", "country":"USA" }, "phone_number": "4153334567", "email": "joedoe@123fakestreet.com" }, "billing":{ "name":{ "first":"Joe", "last":"Doe" }, "address":{ "line1":"633 Folsom St", "line2":"Floor 7", "city":"San Francisco", "state":"CA", "zipcode":"94107", "country":"USA" }, "phone_number": "4153334567", "email": "joedoe@123fakestreet.com" }, "items": [{ "display_name": "Awesome Pants", "sku": "ABC-123", "unit_price": 1999, "qty": 3, "item_image_url": "http://merchantsite.com/images/awesome-pants.jpg", "item_url": "http://merchantsite.com/products/awesome-pants.html", "categories": [ ["Home", "Bedroom"], ["Home", "Furniture", "Bed"] ] } ], "discounts":{ "RETURN5":{ "discount_amount":500, "discount_display_name":"Returning customer 5% discount" }, "PRESDAY10":{ "discount_amount":1000, "discount_display_name":"President's Day 10% off" } }, "metadata":{ "shipping_type":"UPS Ground", "mode":"modal" }, "order_id":"JKLMO4321", "currency":"USD", "financing_program":"flyus_3z6r12r", "shipping_amount":1000, "tax_amount":500, "total":100000 } affirm.checkout.open()