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Our Businesses
Oil and Gas
United States
Middle East Region
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Doing Business with Us
Supplier Help Desk
Midstream and Marketing
Doing Business with Us - Supplier Overview 

(Versión Español)

Welcome to Occidental's supplier web pages, which provide orientation, support information and tools for prospective or registered suppliers. Occidental Oil and Gas Corporation and its subsidiaries, Occidental Midstream Strategic Development and Centurion Pipeline L.P. are referred to as "Oxy" in these webpages.

Prospective Supplier

Occidental invites prospective suppliers to complete the prospective supplier registration. To learn more about our operations, please browse the Operations pages under Our Businesses. Please note that completing the prospective supplier registration does not imply a contract, or intent to purchase goods or services from prospective suppliers by Occidental.

Registered Suppliers

iSupplier Portal Access -
To access the iSupplier Portal, click here

The iSupplier Portal is an online self-service tool that allows you to directly access information and conduct transactions. In the future, Occidental may decide exclusively to use suppliers that are registered on its iSupplier Portal.

Important: If your company is currently doing business with Occidental, but does not have access to the iSupplier Portal, please contact your Occidental representative.

Training Material


Visit this 
Presentation to see an overview of the iSupplier Portal functionality.

iSupplier Portal User Guides

Note: For step by step instructions on how to use the iSupplier Portal, click on the applicable link below:


Supplier Key Action

User Guides


General overview of the iSupplier Portal to access, reset passwords, navigate, define preferences and notifications.


Overview to Access, Passwords, Navigation and Notifications


iSupplier Users Administration

Create, update and inactivate iSupplier Portal Users; reset user passwords.

Administrate Users - Security Administrator


Request for Information

View, acknowledge and submit response to Request for Information (RFI).


Respond to RFI


Request for Quotation

View, acknowledge and submit quote for Request for Quotation (RFQ).

Quote RFQ


Purchasing Document

View Purchasing Documents (Purchase Orders, Services Orders, Contracts, Master Services Agreements, etc.); and their price; electronically accept a Purchasing Documents.


View and/or Accept Purchasing Documents


Receipts and Returns

View Receipts and Returns

View Receipts and Returns


Contractual Deliverables

View and submit information and documentation required by Occidental, associated with a Purchasing Document.


View and/or Submit Contractual Deliverables


Invoices and Payments

View Invoices and Payments.

Electronically submit invoices against Standard Purchase Orders.

Electronically submit credit memos. 

Electronically view/submit Supplier Charges/Field Ticket Invoices against Agreements.

View Invoices and Payments

Submit Electronic Invoices

Submit Electronic Credit Memos

View and Submit Electronic Supplier Charges Invoices


Occidental organizes webinar online live training sessions for specific topics. As needed, enroll in the following sessions.






Supplier Charges (GBPA)/Standard Purchase Orders (Match to PO)

View and accept purchasing documents.
Submit supplier charges. View supplier charge statuses, invoices and payments. Create SPO matched invoices. Submit credit memos.



Click Here

Click Here

Create/Submit Match to PO invoices for Standard Purchase Orders (SPOs) View/Accept Purchasing Documents
Create/Submit Match to PO Invoices (SPOs)
Create/Submit Credit Memos
View Invoices/Payments


Click Here

Click Here

Create/Submit Supplier Charges Only View/Accept Purchasing Documents
Create/Submit Supplier Charges
Create/Submit Credit Memos
View Invoices/Payments


Click Here

Click Here


Registered Supplier Information Modification

Occidental considers it critical that suppliers keep all supplier data current. If there are any changes in your company information, such as: legal entity name, addresses, bank accounts, tax ID, legal structure, iSupplier Portal – Supplier Security Administrator, etc., please complete and submit the Registered Supplier Information Modification Form.

Frequently Asked Questions (FAQs)

For additional help regarding the iSupplier Portal, ADP® and other related topics, visit the Frequently Asked Questions.

Supplier Help Desk

Visit the Supplier Help Desk section to access the Inquiry Form and/or phone numbers and request additional help.