# Appendix - [Fulfillment and cancellation flow](https://docs.digitalriver.com/salesforce-b2b/2.1.0/appendix/fulfillment-and-cancellation-flow.md): This page contains additional helpful information about Fulfillments. - [Issuing refunds](https://docs.digitalriver.com/salesforce-b2b/2.1.0/appendix/issuing-refunds.md): Learn how to issue refunds through the Salesforce B2B Commerce App. - [Managing regulatory fees](https://docs.digitalriver.com/salesforce-b2b/2.1.0/appendix/managing-regulatory-fees.md): Learn how to manage regulatory fees. - [Managing subscriptions](https://docs.digitalriver.com/salesforce-b2b/2.1.0/appendix/managing-subscriptions.md): Understand how the Salesforce B2B Commerce App supports the processing of recurring installment payments. - [Salesforce B2B Commerce App logs](https://docs.digitalriver.com/salesforce-b2b/2.1.0/appendix/salesforce-b2b-commerce-app-logs.md): Learn how to work with the Salesforce B2B Commerce App logs. - [Uploading tax certificates (US TEMS)](https://docs.digitalriver.com/salesforce-b2b/2.1.0/appendix/uploading-tax-certificates-us-tems.md): Understand how customers upload tax certificates. - [VAT invoices](https://docs.digitalriver.com/salesforce-b2b/2.1.0/appendix/vat-invoices.md): Understand how VAT invoices are viewed and downloaded. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.digitalriver.com/salesforce-b2b/2.1.0/appendix.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.