Purchase Batch
==============

**Batch Type Key:** ``purchase``

**Purpose:** Provides workflows for ordering, receiving, and invoice costing.

**Default Handler:** :class:`~rattail:rattail.batch.purchase.PurchaseBatchHandler`

There are 3 "modes" for this type of batch, meant to correspond to the
life-cycle of a purchase order:

- Ordering
- Receiving
- Costing

Depending on the mode, data for the batch may come from any of:

- PO file or invoice file from the vendor
- purchase order data from the POS system
- directly entered via the Rattail app

Execution of this type of batch will also depend on the mode.  The
default handler may just update Rattail data (e.g. ``purchase`` table)
according to the batch.  If applicable, you may want a custom handler
so it updates your POS instead.