v3 invoices changes

In v3, there are a range of improvements and new features with invoice operations.

v2	v3
Create an invoice with `POST /v2/Crud/Create/Invoice.json`. An existing customer is required for creating an invoice. Email the created invoice to the customer with `POST /v2/SendInvoice.json`.	Creating an invoice with `POST /v3/invoices` combines 3 operations. 1. Create an invoice 2. In addition, you can create a customer for the invoice 3. You can email the invoice to the customer The request and response field names have changed. Relevant fields are grouped under the `customer`, `lineItems`, and `processingOptions` objects. See Invoices for more information.
Read an invoice with `POST /v2/Crud/Read/Invoice.json`.	Get invoice details with `GET /v3/invoices/{invoiceId}`. `invoiceId` is now set as a path parameter. See Get invoice details in the API reference for more information.
List invoices with `POST /v2/List/Invoice.json`.	Get list of invoices with `GET /v3/invoices`. Filtering and sorting values are now query parameters. For filtering, use the `filters=field:op:value` format . The operator values are now acronyms. For example, `=` is now `eq` and `>=` is now `gte`. For sorting, use the `sort=field:order` format. For example, sort by `dueDate` in the ascending order with `sort=dueDate:asc`. The response includes `nextPage` and `prevPage` values for you to navigate between the pages of results. See Search operations with lists for more information.
Update an invoice with `POST /v2/Crud/Update/Invoice.json`.	Replace an invoice with `PUT /v3/invoices/{invoiceId}`. This is a PUT operation and `invoiceId` is now set as a path parameter. The request and response field names have changed. Use the v3 PUT operation to add, remove, or replace the number of line items in an invoice. You can also update other invoice details. Update an invoice with `PATCH /v3/invoices/{invoiceId}`. This is a PATCH operation and `invoiceId` is now set as a path parameter. The request and response field names have changed. Use the v3 PATCH operation to modify existing line item details, such as `amount`, `quantity`, and `description`. You can also update other invoice details. See Replace an invoice and Update an invoice in the API reference for more information.
Delete an invoice with `POST /v2/Crud/Delete/Invoice.json`	Archive an invoice with `POST /v3/invoices/{invoiceId}/archive`. `invoiceId` is now set as a path parameter. In the response, `isActive` is now `archived`. The `archived` field is boolean. See Archive an invoice in the API reference for more information.
Undelete an invoice with `POST /v2/Crud/Undelete/Invoice.json`.	Restore an invoice with `POST /v3/invoices/{invoiceId}/restore`. `invoiceId` is now set as a path parameter. In the response, `isActive` is now `archived`. The `archived` field is boolean. See Restore an archived invoice in the API reference for more information.