# How-to Guides

## Processing Invoices and Payments

**Retrieving Invoices:**

Use `GET /invoices` to retrieve invoice details and status.

**Getting Invoice PDFs:**

Use `GET /invoice-summaries` to download invoice PDF documents.

**Recording Payments:**

Use `POST /invoice-payment-events` to record payments or undo payments.

**Reprocessing Failed Payments:**

Use `POST /invoice-payment-reprocess` to retry failed integrated payment attempts.

**Resending Invoices:**

Use `POST /resend-invoice` to send a copy of the customer invoice email to configured contacts.