We will guide you step by step through the whole installation and configuration process.

In the most recent versions of the module, you will find only one package that supports PHP 7.1 and later.

The first one that supports PHP 5.6 up to PHP 7.0, and the second one addressed to PHP 7.1 up to PHP 7.3.
Note: Keep in mind that PHP versions 5.6 up to 7.0 are no longer officially supported and their security issues are not fixed or released any more. Find more info here.

The content of the package to upload should look like this.

This file is located in 'modules/addons/discount_center/license_RENAME.php'. Rename it from 'license_RENAME.php' to 'license.php'.

Enter your license key between quotation marks as presented on the following screen. You can find your license key in our client area → 'My Products'.

Log in to your WHMCS admin area. Go to 'System Settings' → 'Addon Modules'. Afterward, find 'Discount Center' and press the 'Activate' button.

To do so, click on the 'Configure' button, check required group of administrators and press 'Save Changes'.

You can access your module under 'Addons' → 'Discount Center'.

Select the box to enable the discount, it will be put into practice immediately on creation. You may also configure this option under 'Settings'.
Name the discount and, the most importantly, declare promotional and required products.

Note: You must select at least one promotional product to be allowed to move to the next step.

Additionally, you may add any items into 'Required Active Products' - a client must already own and have them active. Only then the discount can be applied.
All of the chosen here products are required. Please note that only active products are taken into consideration.
Press 'Next' to continue.

Press 'Next' when ready.

• All - all of your clients and guests
• Offer it to new clients only. Move to 'Addons' → 'Discount Center' → 'Settings' to define which of your clients shall be considered 'new'.
• Chosen clients only: enumerate specific clients or enter clients group name. All clients from this group will be given a discount.
  
  

Recurring Discounts - enable discount for recurring orders. If you do not select this option, then discount will be applied only once with the first payment.
If this option is enabled, you also have to define the number of months that the discount will be applied to the invoice. You can also provide 0 value for lifetime discount.

Finally, you may define the Validity Period.
If selected, you have to point the starting and ending date of the promotion. This option is especially helpful when setting up sales like Cyber Monday or Black Friday.
It is usually clearly stated how long such sale shall last.

Press 'Save Changes' to confirm creation of the new discount.

• Specified Products In Cart - select products/domains/addons which you expect to be in the cart.
  The sum of these items is compared with the set up later on thresholds to apply an adequate discount.
  

Please note that items added into these fields are required.

• Required Active Products - the discount can be applied only if a client already owns pointed here items.
  Please note that the products must be active!
  

Please note that items added into these fields are required.

• If Price Is Higher Than - declare a price limit and only more expensive of the products than the limit here will be charged with the discount
• If Price Is Lower Than - declare a maximum price limit and only cheaper products than the limit declared here will be charged with the discount

• Promotional Products - list items that the discount can be applied to (products/addons/domains)

• All Specified Products - every product that is on the list of specified (see previous point) will be charged with the discount
  

• Active Services Quantity - the discount takes account of the total number of ordered products and active services already owned by a client.
  The services have to be added in the 'Specified Products In Cart' section. The 'Active Services Quantity' discount may apply to:
  
  • the existing services of a recurring type - to its next billing cycle,
  • the newly ordered services - to the first and subsequent invoices (if applicable).
    

In 'Thresholds' you set up the minimum number of client's active services which, together with products included in a new order, are taken into account by this application type.
Specify a percentage value for each discount threshold, you can set up as many of them as you need by pressing the '+' button.

For example:

• The administrator sets a 10% discount valid when a number of active products amounts to 5. When a client who already owns 3 active services puts in a new order,
  only 2 additional products need to be added to the cart to activate this discount.
  

In case there are multiple discount levels configured, the module will adjust the discount to the highest tier possible. For instance:

• The administrator formulates two rules: a 10% discount available when a number of active products amounts to 5 and a 15% discount valid if a quantity of active services equals 8.
  When a client owns 3 active services and purchases 5 new products, the module will switch the discount from 10% to 15%.
  

What is more, if any of active services is terminated and a current number of active services is lower than the one set for the discount, the module removes the discount from all active products.
However, if there are multiple discount thresholds configured, then the module will downgrade the discount applied to the lower tier.

When ready, press 'Next' to continue.

Here, you may decide which of your clients the discount should be entitled to purchase products with a discount.
You may grant it to all of your clients and guests, offer it to new clients only or manually select desired usernames.
It is also possible to enter client groups names here and offer discounts to bundles of clients.
Other options:

• 'Recurring Discounts' - discount is applied to following payments as well
• 'Multiple Quantity' - apply the discount to more than one product
• 'Promotion Code' - decide if you want to disable the discount if a promotion code is used
• 'Validity Period' - set up time frames
• 'Bundle' - toggle to disable the discount if product bundles are used
  

You can read more about these options and their functions here
Press 'Save Changes' to confirm creation of the new discount.

All you need to do is specify the number of days that the discount will be active since the invoice has been created.
Look below to see how to configure such a discount exactly.

Next, you must enter a number of days that the early discount will remain active since the moment the invoice has been created. This is an obligatory field.
Underneath, there are 'Products', 'Addons' and 'Domains' fields - select which of the services will allow early payments with the discount.
Note: Only recurring services are supported and allowed to choose.

Remember to save the changes when the early payment discount configuration is ready.

• Discount Center - Early Payment Discount Created
• Discount Center - Early Payment Discount Canceled
• Discount Center - Early Payment Discount Notification
  

They are included in the module, once you install or update the module, they will appear in the System Settings → Email Templates → Invoice Messages section.

{$client_name} {$signature}

{$invoice_num} {$invoice_date_created} {$invoice_date_due {$invoice_total} {$invoice_balance} {$invoice_html_contents} {$invoice_link}

{$earlyPayment.name} {$earlyPayment.due_date} {$earlyPayment.period}

• New Client Status - Number Of Days - set up the number of days a client will be considered 'New'.
  

Such information is necessary when you select 'New - give promotion to new clients only' option as 'Activation Rule' for any of your set up discounts.
If you enter for example 14, then, if this option is selected for any of the discounts, clients with accounts not older than 14 days can have the discount applied.
Note that providing 0 value will make discount applicable only for unregistered clients.

• Hide Guide here if you are already familiar with its content or unselect to read it again.
  
• Autoapply Discounts - if checked, all newly created discounts will be enabled. You may change the status of a single discount manually.
• Order Form - define an order form if you are using a custom one.
• Order Note - decide if information about discounts should be saved in order note.

1. {$dc_product_price} - Variable that allows a full product price to be displayed
2. {$dc_product_discount_price} - Variable displaying a discount product price.
3. {$dc_product_setup_price} - Variable displaying a full setup price.
4. {$dc_product_setup_discount_price} - Variable displaying a discount setup price.
5. {$dc_addon_prices[$addon.name]} - Variable that allows a full addon price to be visible
6. {$dc_total_discount_price} - Variable displaying total discount product price.

Open the order form you are currently using, for example 'Modern', find 'ordersummary.tpl' file and enter the above variables as shown below:

<tr><td>{$producttotals.productinfo.name}</td><td class="text-right"> VARIABLE ONE {$producttotals.pricing.baseprice}</td></tr>
<tr><td>+ {$addon.name}</td><td class="text-right"> VARIABLE FIVE </span>{/if} {$addon.recurring}</td></tr>

Please note that the below screen is just an example of variable usage, you may simply enter pure variable without any styles or change them according to your needs.
Be careful when you change the code snippets. If you are not sure how to change it, then consult it firstly with a professional.

Keep in mind there is a quick and easy option in our client area that will let you upgrade the license of your module to an open source version at any time - and at a lower price!
To take advantage of it, simply use the License Upgrade button located on the product's page and a discounted invoice will be generated automatically.