diff --git a/rattail_corepos/commands.py b/rattail_corepos/commands.py
index 1a2f7dd..ba5c234 100644
--- a/rattail_corepos/commands.py
+++ b/rattail_corepos/commands.py
@@ -54,3 +54,12 @@ class ImportCOREPOS(commands.ImportSubcommand):
         if 'args' in kwargs:
             kwargs['corepos_dbkey'] = kwargs['args'].corepos_dbkey
         return kwargs
+
+
+class CoreImportSquare(commands.ImportFromCSV):
+    """
+    Import transaction data from Square into CORE
+    """
+    name = 'corepos-import-square'
+    description = __doc__.strip()
+    handler_spec = 'rattail_corepos.corepos.importing.square:FromSquareToCoreTrans'
diff --git a/rattail_corepos/config.py b/rattail_corepos/config.py
index c27fc9d..d7d7666 100644
--- a/rattail_corepos/config.py
+++ b/rattail_corepos/config.py
@@ -37,9 +37,15 @@ class RattailCOREPOSExtension(ConfigExtension):
     key = 'rattail-corepos'
 
     def configure(self, config):
-        from rattail_corepos.db import Session
+        from corepos.db import Session as CoreSession
+        from corepos.trans.db import Session as CoreTransSession
 
         engines = get_engines(config, section='rattail_corepos.db')
         config.corepos_engines = engines
         config.corepos_engine = engines.get('default')
-        Session.configure(bind=config.corepos_engine)
+        CoreSession.configure(bind=config.corepos_engine)
+
+        engines = get_engines(config, section='rattail_coretrans.db')
+        config.coretrans_engines = engines
+        config.coretrans_engine = engines.get('default')
+        CoreTransSession.configure(bind=config.coretrans_engine)
diff --git a/rattail_corepos/corepos/__init__.py b/rattail_corepos/corepos/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/rattail_corepos/corepos/importing/__init__.py b/rattail_corepos/corepos/importing/__init__.py
new file mode 100644
index 0000000..62949e3
--- /dev/null
+++ b/rattail_corepos/corepos/importing/__init__.py
@@ -0,0 +1,8 @@
+# -*- coding: utf-8; -*-
+"""
+Importing data into CORE-POS
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+from . import model
diff --git a/rattail_corepos/corepos/importing/model.py b/rattail_corepos/corepos/importing/model.py
new file mode 100644
index 0000000..08fad0f
--- /dev/null
+++ b/rattail_corepos/corepos/importing/model.py
@@ -0,0 +1,33 @@
+# -*- coding: utf-8; -*-
+"""
+CORE-POS model importers
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+from rattail import importing
+
+from corepos.db import model as corepos
+from corepos.trans.db import model as coretrans
+
+
+class ToCore(importing.ToSQLAlchemy):
+    pass
+
+
+class ToCoreTrans(importing.ToSQLAlchemy):
+    pass
+
+
+class CustomerImporter(ToCore):
+    """
+    CORE-POS customer data importer.
+    """
+    model_class = corepos.Customer
+
+
+class TransactionDetailImporter(ToCoreTrans):
+    """
+    CORE-POS transaction data importer.
+    """
+    model_class = coretrans.TransactionDetail
diff --git a/rattail_corepos/corepos/importing/square.py b/rattail_corepos/corepos/importing/square.py
new file mode 100644
index 0000000..16e7baa
--- /dev/null
+++ b/rattail_corepos/corepos/importing/square.py
@@ -0,0 +1,174 @@
+# -*- coding: utf-8; -*-
+"""
+Square -> CORE-POS data importing
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+import re
+import datetime
+import decimal
+
+import six
+import sqlalchemy as sa
+
+from corepos.trans.db import Session as CoreTransSession, model as coretrans
+
+from rattail import importing
+from rattail.util import OrderedDict
+from rattail_corepos.corepos import importing as corepos_importing
+
+
+class FromSquareToCoreTrans(importing.ToSQLAlchemyHandler):
+    """
+    Square -> CORE-POS import handler.
+    """
+    host_title = "Square"
+    local_title = "CORE-POS"
+
+    def make_session(self):
+        return CoreTransSession()
+
+    def get_importers(self):
+        importers = OrderedDict()
+        importers['TransactionDetail'] = TransactionDetailImporter
+        return importers
+
+
+class FromSquare(importing.FromCSV):
+    """
+    Base class for Square -> CORE-POS importers.
+    """
+
+
+class TransactionDetailImporter(FromSquare, corepos_importing.model.TransactionDetailImporter):
+    """
+    Transaction detail importer.
+    """
+    key = 'store_row_id'
+    supported_fields = [
+        'store_row_id',
+        'date_time',
+        'card_number',
+        'upc',
+        'description',
+        'quantity',
+        'unit_price',
+        'discount',
+        'tax',
+        'total',
+    ]
+
+    def setup(self):
+        super(TransactionDetailImporter, self).setup()
+
+        # cache existing transactions by ID
+        self.transaction_details = self.cache_model(coretrans.TransactionDetail,
+                                                    key=self.transaction_detail_key)
+
+        # keep track of new IDs
+        self.new_ids = {}
+        self.last_new_id = self.get_last_new_id()
+
+    def transaction_detail_key(self, detail, normal):
+        return (
+            detail.store_id,
+            detail.register_number,
+            detail.date_time,
+            detail.upc,
+        )
+
+    def get_last_new_id(self):
+        # TODO: pretty sure there is a better way to do this...
+        return self.session.query(sa.func.max(coretrans.TransactionDetail.store_row_id))\
+                           .scalar() or 0
+
+    currency_pattern = re.compile(r'^\$(?P<amount>\d+\.\d\d)$')
+    currency_pattern_negative = re.compile(r'^\(\$(?P<amount>\d+\.\d\d)\)$')
+
+    def parse_currency(self, value):
+        value = (value or '').strip() or None
+        if value:
+
+            # first check for positive amount
+            match = self.currency_pattern.match(value)
+            if match:
+                return float(match.group('amount'))
+
+            # okay then, check for negative amount
+            match = self.currency_pattern_negative.match(value)
+            if match:
+                return 0 - float(match.group('amount'))
+
+    def normalize_host_object(self, csvrow):
+
+        # date_time
+        date = datetime.datetime.strptime(csvrow['Date'], '%m/%d/%Y').date()
+        time = datetime.datetime.strptime(csvrow['Time'], '%H:%M:%S').time()
+        date_time = datetime.datetime.combine(date, time)
+
+        # upc
+        upc = csvrow['SKU']
+
+        # store_row_id
+        key = (
+            0,                  # store_id
+            None,               # register_number
+            date_time,
+            upc,
+        )
+        if key in self.transaction_details:
+            store_row_id = self.transaction_details[key].store_row_id
+        else:
+            store_row_id = self.last_new_id + 1
+            self.new_ids[store_row_id] = csvrow
+            self.last_new_id = store_row_id
+
+        # card_number
+        card_number = csvrow['Customer Reference ID'] or None
+        if card_number:
+            card_number = int(card_number)
+
+        # quantity
+        quantity = float(csvrow['Qty'])
+
+        # unit_price
+        unit_price = self.parse_currency(csvrow['Gross Sales'])
+        if unit_price is not None:
+            unit_price /= quantity
+            unit_price = decimal.Decimal('{:0.2f}'.format(unit_price))
+        elif csvrow['Gross Sales']:
+            log.warning("cannot parse 'unit_price' from: %s", csvrow['Gross Sales'])
+
+        # discount
+        discount = self.parse_currency(csvrow['Discounts'])
+        if discount is not None:
+            discount = decimal.Decimal('{:0.2f}'.format(discount))
+        elif csvrow['Discounts']:
+            log.warning("cannot parse 'discount' from: %s", csvrow['Discounts'])
+
+        # tax
+        tax = self.parse_currency(csvrow['Tax'])
+        if csvrow['Tax'] and tax is None:
+            log.warning("cannot parse 'tax' from: %s", csvrow['Tax'])
+        tax = bool(tax)
+
+        # total
+        total = self.parse_currency(csvrow['Net Sales'])
+        if total is not None:
+            total = decimal.Decimal('{:0.2f}'.format(total))
+        elif csvrow['Net Sales']:
+            log.warning("cannot parse 'total' from: %s", csvrow['Net Sales'])
+
+        return {
+            'store_row_id': store_row_id,
+            'date_time': date_time,
+            'card_number': card_number,
+            'upc': upc,
+            'description': csvrow['Item'],
+            'quantity': quantity,
+            'unit_price': unit_price,
+            'discount': discount,
+            'tax': tax,
+            'total': total,
+        }
diff --git a/setup.py b/setup.py
index 1463138..493b798 100644
--- a/setup.py
+++ b/setup.py
@@ -104,6 +104,7 @@ setup(
         ],
 
         'rattail.commands': [
+            'corepos-import-square = rattail_corepos.commands:CoreImportSquare',
             'import-corepos = rattail_corepos.commands:ImportCOREPOS',
         ],