Imagine you could purchase items from your store, with pure JavaScript in the browser. How would it look like? Here's what I came up with. Forks & comments much appreciated! #nobackend #dreamcode

payments_dreamcode.js

// purchase a product with a credit card
purchase('productId')
.using( {
  cc: "4556934156210213",
  valid: "2016-10",
  csc: "123"
} )

// purchase a product with paypal
purchase('productId')
.using( 'paypal' )

// upgrade a user to a pro plan, payment via paypal.
purchase(
  account.upgradoTo( 'pro' )
).using('paypal')

This looks a lot like: http://simplecartjs.org/

Seems secure to me, just make sure the sensitive information is only stored transiently and always sent over HTTPS.

wow, simpleCart looks very nice indeed!

Bitcoin payments can be easily added with:
http://bitcore.io/playground/#/address and #/transaction

// ...
.using( 'bitcoin/bitcore' )
.payment_request({
  address: "1address...",
  amount: 10000, // satoshis
})

or some more sophisticated and complete example like:

// ...
.using(['bitcoin/bitcore', 'bitcoin/blockchain_info', 'bitcoin/blockr_io'])
.to({
  address: "1address...",
  amount: 10000, // satoshis
}).sign({
  privateKey: "5pvtkey...." // signs the transaction, doesn't send the private key
}).propagate(['blockchain_info', 'blockr_io'])

super-alpha version, need to be discussed I think, also what about multisig? Anyway dreamcode ftw!

FYI, there's a standard for this now.
Although the API is a bit more complex.