If you are an payment application contact who has been invited to provide a detailed breakdown of your Bill of Quantities on a commitment, a Procore user (typically, an payment application administrator) sends you an invite by email. The detailed breakdown is called a Subcontractor Bill of Quantities. See What is a Subcontractor Bill of Quantities? The invitation resembles the example pictured below. Do NOT send an email reply to this message, as it comes from an unmonitored email address. Instead, follow the steps in the Answer below to gain access to the commitment in the Procore web application.
Before a Procore user can invite you to submit your Subcontractor Bill of Quantities, that user needs to ensure that you Procore user account has been granted the 'Required User Permissions' detailed in Submit a New Payment application as a Payment Application Contact.
If you have been designated as the payment application contact on a commitment, you might receive an email message that resembles the one pictured below. Typically, it is sent to you by a payment application administrator.

To open the commitment in your computer's web browser, choose from these options: