The FreshBooks for WHMCS module allows you to automatically create your customers in WHMCS as Clients in FreshBooks, and to optionally create drafts or send invoices for orders and vice-versa .

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FreshBooks | WHMCS
Documentation
Overview
The FreshBooks for WHMCS module allows you to automatically create
your customers in WHMCS as Clients in FreshBooks, and to optionally
create drafts or send invoices for orders and vice­versa . Yes, it supports
Two Way Syncing ( export and import data between WHMCS and
FreshBooks ) Payments can be synced between invoices and orders, and
FreshBooks items can also be linked to WHMCS products for better
reporting.
Apart from that , it gives the ability to map data between WHMCS and
FreshBooks before syncing for better synchronization which includes Tax
Mapping,Payment Method Mapping.
Not using Freshbooks yet? ​Sign up for a free trial​ to get started with easy
invoicing!

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Installation
1. Download your module from your DashBoard ­> My Module ­> Your
Product/services ­> click to view it and download it under "download
sections".
2. Unzip the file and you may have more than two folders name "5.4 and
5.5 " ( PHP versions )
3. Choose one of them according to your PHP version ( To check PHP
version ­ Go to Admin Area ­> Utilities ­> System ­> PHP Info OR using
Terminal ­ command ­ PHP ­v ). ( you can skip this step and simply choose
the latest one )
4. There will be a folder named "FreshBookIntegration" that need to be
placed into your addons directory i.e (<whmcs­dir>/modules/addons/
5. Activate your module from Admin Area ( Admin area ­> Setup ­> Addon
modules ­> Freshbooks for WHMCS ).

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Setup and Configuration
1. Go to WHMCS Admin Area ­> Setup ­> Addons Modules ­> FreshBooks
for WHMCS to get settings.
2. Enter Your License . Your can get this license key from your Client Area
­> My Module & Services
3. Enter your API URL. You can get this information by logging into
FreshBooks and navigating to My Account > FreshBooks API.
4. Enter your API token. You can get this information by logging into
FreshBooks and navigating to My Account > FreshBooks API.