This Howto describes principles of configuring Paypal and Arrow Telecom's Arrow Billing (AB) to provide automatic payment processing. Datatechlabs Arrow Billing can be integrated with Paypal IPN (Instant payment Notification) System to receive notifications from Paypal online payment processing system about payment transactions. AB verifies payment information and updates user's balance. In order to use this feature, you must have Paypal Business or Premium account available. This is the snapshot of your Paypal Business account screen:  As of Billing version 1.4.2, you are able to assign separate Paypal account to each of your resellers. In this case, when a customer belonging to a particular reseller pays via Paypal, the recipient of the money is reseller. This is done automatically by Arrow Billing. Table of Contents
Basic Principles The link for Paypal payment is located in Arrow Billing enduser's area. Once logged in, user accesses Paypal payment link using Payments on left side navigation panel. System administrator has choice of setting up either fixed amounts which the user is allowed to pay or leave choice to the user - in such case there will be an empty box presented in Paypal payments page where the user can choose any amount to pay.
Once payment method and amount is chosen, the user is presented with next page which confirms payment amount and method:
By clicking on Paypal logo, user is redirected to Paypal secure payment processing page. Depending on users preferences, he/she may be prompted to login to paypal, choose payment method and make payment. It is important for user to click "Continue" button once payment is done. It will then take user back to Arrow Billing enduser's area where he/she will be presented with Payment detail record confirming payment. Both buyer and seller will receive payment confirmation email from Paypal as well.
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Arrow Billing Configuration for Paypal Payment Processing Directly to Service Provider (no reseller) Click Tools on the left menu, and then click on Options tab. Following settings are critical for setting up Paypal support: General Billing Server URL Enter valid DNS name or IP address of your Arrow Billing server including URL. In most cases this is same URL which you use for logging into AB. Omit part which comes after ? (question mark) symbol inclusive. This setting is very critical, as it tells Paypal where to direct user back after purchase and where to send payment confirmation.
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Online Payment Systems: Paypal Enable Check this box to globally enable/disable this feature. 
Put In Test Mode Check this checkbox when doing tests. When checked, all transactions will be executed against Paypal Sandbox Development Environment (www.sandbox.paypal.com). Please see Paypal Developer Documentation for more information (https://developer.paypal.com/). Useful for development only. Paypal Receiver Email Type Your Registered Paypal payments receiver email here. Paypal Item Name Dispaly for Endusers This field is optional. It will display Item name and description in PayPal payments page. Currency Payment Currency. Plese check with Paypal which currency (currencies) are available in your country.
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Paypal Configuration Setting Up IPN You must set up IPN (Instant Payment Notifications) to make Arrow Billing properly update users account once payment is made. To set up IPN: 
Log in to your Business or Premium PayPal account;
Click the Profile subtab;
Click The Instant Payment Notification Preferences link in the Selling Preferences column;
Click Edit;
Click the checkbox and and enter URL at which you will receive IPN notifications. In default AB configuration, this URL consists of Billing Server URL ammended with users/userspage.php. Example: http://billing.mycompany.com/billing/users/userspage.php http://127.0.0.1/billing/users/userspage.php
Click Save.
show top Arrow Billing Configuration for Paypal Payment Processing for Reseller Log into Arrow Billing as Service Provider (root) user.
Click "Companies", and choose "reseller" in "Type of Company" dropdown box:
Click Search to find the Reseller you would like to set up Click on Company name to open Company detail screen Scroll down, find reseller account property and click on reseller account name/link to open reseller property window
Once in, click on Reseller Properties tab on top menu:
The settings in Paypal are the same as settings for root user described in above chapter.
click "Modify Settings" button once settings have been changed.
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