diff --git a/pyintacct/models/company.py b/pyintacct/models/company.py
index c5fd332..f6de8b1 100755
--- a/pyintacct/models/company.py
+++ b/pyintacct/models/company.py
@@ -1,7 +1,20 @@
 from .base import API21Object
-from pydantic import BaseModel
-from typing import Optional
+from pydantic import BaseModel, Field
+from typing import Optional, List
 
+class AttachmentDetail(BaseModel):
+    attachmentname: Optional[str] = None
+    attachmenttype: Optional[str] = None
+    attachmentdata: Optional[str] = None
+
+class Attachment(BaseModel):
+    attachment: List[AttachmentDetail] = Field(default_factory=list)
+
+class SupDoc(API21Object):
+    supdocid: Optional[str] = None
+    supdocfoldername: Optional[str] = None
+    supdocdescription: Optional[str] = None
+    attachments: Attachment = Field(default_factory=Attachment)
 
 class MailAddress(BaseModel):
     address1: Optional[str] = None
@@ -14,7 +27,6 @@ class MailAddress(BaseModel):
     latitude: Optional[str] = None
     longitude: Optional[str] = None
 
-
 class Contact(API21Object):
     contactname: str = ...
     printas: Optional[str] = None
diff --git a/tests/test_company.py b/tests/test_company.py
index 0d10f38..c3e441a 100755
--- a/tests/test_company.py
+++ b/tests/test_company.py
@@ -1,4 +1,6 @@
-from pyintacct.models.company import Contact
+import pytest
+
+from pyintacct.models.company import Contact, MailAddress, SupDoc, Attachment, AttachmentDetail
 from tests.utils import random_str
 
 
@@ -26,3 +28,95 @@ def test_create_from_dict(client):
     contact['CONTACT']['PRINTAS'] = 'MyTestContact1'
     client.update(contact)
     client.delete(Contact, [name])
+
+
+def test_create_contact_with_mailaddress(client):
+    contact_name = f'ρyIntacct-{random_str()}'
+    mail_address = MailAddress(
+        address1='123 Main St',
+        city='Anytown',
+        state='CA',
+        zip='12345',
+        country='USA'
+    )
+    contact = Contact(
+        contactname=contact_name,
+        printas=contact_name,
+        mailaddress=mail_address
+    )
+    client.create(contact)
+    contacts = client.read_by_query('CONTACT', f"CONTACTNAME = \'{contact_name}\'")
+    assert len(contacts) == 1
+    contact_key = contacts[0]['RECORDNO']
+    client.delete('CONTACT', [contact_key])
+
+
+def test_create_contact_with_supdoc(client):
+    contact_name = f'ρyIntacct-{random_str()}'
+    attachment_detail = AttachmentDetail(
+        attachmentname='test_attachment',
+        attachmenttype='PDF',
+        attachmentdata='base64encodedstring'
+    )
+    attachment = Attachment(attachment=[attachment_detail])
+    supdoc = SupDoc(
+        supdocid='SUPDOC-001',
+        supdocdescription='Test SupDoc',
+        attachments=attachment
+    )
+    contact = Contact(
+        contactname=contact_name,
+        printas=contact_name,
+        supdoc=supdoc
+    )
+    client.create(contact)
+    contacts = client.read_by_query('CONTACT', f"CONTACTNAME = \'{contact_name}\'")
+    assert len(contacts) == 1
+    contact_key = contacts[0]['RECORDNO']
+    client.delete('CONTACT', [contact_key])
+
+
+def test_create_contact_with_full_details(client):
+    contact_name = f'ρyIntacct-{random_str()}'
+    mail_address = MailAddress(
+        address1='123 Main St',
+        city='Anytown',
+        state='CA',
+        zip='12345',
+        country='USA'
+    )
+    attachment_detail = AttachmentDetail(
+        attachmentname='test_attachment',
+        attachmenttype='PDF',
+        attachmentdata='base64encodedstring'
+    )
+    attachment = Attachment(attachment=[attachment_detail])
+    supdoc = SupDoc(
+        supdocid='SUPDOC-001',
+        supdocdescription='Test SupDoc',
+        attachments=attachment
+    )
+    contact = Contact(
+        contactname=contact_name,
+        printas=contact_name,
+        companyname='MyCompany',
+        phone1='123-456-7890',
+        email1='test@example.com',
+        mailaddress=mail_address,
+        supdoc=supdoc
+    )
+    client.create(contact)
+    contacts = client.read_by_query('CONTACT', f"CONTACTNAME = \'{contact_name}\'")
+    assert len(contacts) == 1
+    contact_key = contacts[0]['RECORDNO']
+    client.delete('CONTACT', [contact_key])
+
+
+@pytest.fixture
+def make_contact_record():
+    def _make_contact(contact_name):
+        return Contact(
+            contactname=contact_name,
+            printas=contact_name
+        )
+    return _make_contact
diff --git a/tests/test_order_entry.py b/tests/test_order_entry.py
new file mode 100644
index 0000000..2bd2d07
--- /dev/null
+++ b/tests/test_order_entry.py
@@ -0,0 +1,45 @@
+from decimal import Decimal
+
+from pyintacct.models.base import Date
+from pyintacct.models.order_entry import SOTransaction, SOTransactionItem, SOTransactionItems
+
+
+def test_create_sotransaction(client):
+    items = SOTransactionItems(sotransitem=[
+        SOTransactionItem(itemid='1001', quantity=Decimal('5'), unit='Each', locationid='100', price=Decimal('100.00')),
+        SOTransactionItem(itemid='1002', quantity=Decimal('3'), unit='Each', locationid='100', price=Decimal('200.00'))
+    ])
+
+    transaction = SOTransaction(
+        transactiontype='Sales Order',
+        datecreated=Date(year='2024', month='6', day='18'),
+        customerid='CUST-1000',
+        sotransitems=items,
+        termname='Net 30',
+        basecurr='USD',
+        currency='USD',
+        exchratetype='Intacct Daily Rate'
+    )
+
+    assert transaction.transactiontype == 'Sales Order'
+    assert transaction.datecreated == Date(year='2024', month='6', day='18')
+    assert transaction.customerid == 'CUST-1000'
+    assert transaction.sotransitems == items
+    assert transaction.termname == 'Net 30'
+    assert transaction.basecurr == 'USD'
+    assert transaction.currency == 'USD'
+    assert transaction.exchratetype == 'Intacct Daily Rate'
+    assert len(transaction.sotransitems.sotransitem) == 2
+    client.create(transaction)
+
+
+def test_query_transactions(client):
+    transactions = client.read_by_query(
+        'SODOCUMENT',
+        'CUSTVENDID LIKE \'CUST%\'',
+        fields='*',
+        pagesize=3,
+        docparid='Sales Order'
+    )
+    assert isinstance(transactions, list)
+    assert len(transactions) > 0