incomes_post.js

$.ajax({
  headers: {token: 'OUy_IJxQveSiKGYPPqYQnAumNCSJSilBAX5A9upF4JU'},
  method: "POST",
  url: "http://demo.bonsaierp.com/api/v1/incomes",
  data: {
    income: {
    "date":"2015-11-13",
    "due_date":"2015-11-16",
    "contact_id":1,
    "currency":"BOB",
    "description":"Prueba ingreso",
    "income_details_attributes":[
      {"item_id":1,"price":10.0,"quantity":10,"description":"First item"},
      {"item_id":2,"price":20.0,"quantity":20,"description":"Second item"}
    ]}
  }
})
.done(function(resp) {
  console.log("saved", resp);
})