RedShelf Price Comparison API
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The following information describes how API partners can utilize the RedShelf Price Comparison API to retrieve pricing information and direct users to pre-populated carts.

This API contains two different endpoints: One endpoint is for retrieving pricing information along with the price ID. The second endpoint is for directing a user to a pre-populated cart.

Pricing Endpoint
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.. function:: GET /api/offers.json

**Request Parameters**
*isbn*
  An isbn identifier for a book

**Success Response: Pricing**

The endpoint will return pricing information based on the provided ISBN in addition to a 200 status code response on success

**Example Success Response: Pricing**

::

  {"Status": "OK", "Offers": [{"Price": "0.99", "Id": 565961, "Condition": "E-book", "RentalDays": 30}], "Isbn": "0000000000", "success": true, "code": 200}

Cart Endpoint
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.. function:: GET /checkout

**Request Parameters**
*ids*
  An identifier for a book
*rejoiner_ids*
  A rejoiner id for a book

**Success Response: Cart**

The endpoint will redirect to a populated cart and a 200 response on success

Error responses
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**400 - Invalid ISBN supplied:** ISBN is None, empty, or less than the required length
**400 - The requested book does not exist:** Book does not exist or is not active, not public, or not published
**400 - The requested book is not available:** The book's type of distribution is code
**400 - The requested book is not published:** The book is not published