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Medusa Affiliate Discount

Note: This plugin will be migrated to Medusa v2, when v2 will reach production readiness.

Medusa "Affiliate Discount" is a plugin which enables possibility to create a discount which is a part of affiliation program.

Why?

Affiliate marketing contains different activities. One of them is affiliation program, so a process which allows other entities (companies, people) to promote products in exchange for commission on each sale. "Affiliate Discount" provides possibility to establish such cooperation and monitor usage count and earnings.

Getting Started

Install the package with yarn add @rsc-labs/medusa-affiliate-discount or npm i @rsc-labs/medusa-affiliate-discount.
In medusa-config.js, add the plugin to the plugins array.

const plugins = [
  // ... other plugins
  {
    resolve: `@rsc-labs/medusa-affiliate-discount`,
    options: {
      
    }
  }
]

If you are interested also in using simple Admin UI widget, please add enableUI option.

const plugins = [
  // ... other plugins
  {
    resolve: `@rsc-labs/medusa-affiliate-discount`,
    options: {
      enableUI: true
    }
  }
]

How can I use it?

enableUI enabled

Create a new discount.

Note: Discount shall be assigned only to one region. See Limitations for more info.
Go to customer details page

Note: Plugins assumes that you start your affiliate program with existing customer in your database.
On customer details page, you will find below UI widget. Click Create new

In below screen, choose a discount which you created and define commission in % (0-100).

Click Publish affiliate discount

enableUI disabled

Follow above steps, but using API defined here: API

How it works?

Your "affiliate" (customer to which you assigned a discount) can now share Discount Code to promote your products. When other customers will use provided discount code in their carts, then usage count and earnings are calculated for created affiliate discount.

Details

Usage count and earnings are increased when event Order.COMPLETED is generated.

Note: Remember that Order.COMPLETED is an event which you need to implement - it does not come by default from Medusa or it cannot be even generated from Admin UI.

You can change event on which these parameters are calculated - see Configuration

Earnings are calculated based on commission which you defined previously. The algorithm looks like this:

Take "items" from "order"
For every "item", take "unit_price", "quantity" and "adjustments".
Take every "adjustment" which contains "discountId", which is related to "affiliate_discount".
For every "adjustment" calculate earnings = "unit_price" * "quantity" * commission.
Add new earnings to existing ones.

Configuration

You can change, when earnings and usage count are increased by providing Order.PAYMENT_CAPTURED.

const plugins = [
  // ... other plugins
  {
    resolve: "medusa-affiliate-discount",
    options: {
      updateWhen: 'PAYMENT_CAPTURED',
      enableUI: true
    }
  }
]

Note: Order.PAYMENT_CAPTURED is the ONLY possible value here. If not set, Order.COMPLETED is taken by default. This assumption comes from the fact, that earnings calculation cannot be reverted, so any other event can be easily exploited by the customer.

WARNING: Please remember that plugin uses "eventName" to distinguish Order.PAYMENT_CAPTURED and Order.COMPLETED. It means to have it fully functional you need to have e.g. Redis Event Module - it won't work properly with Local Event Module. In such case calculation of earnings will be done twice (for Order.PAYMENT_CAPTURED and Order.COMPLETED - if you have Order.COMPLETED implemented), so please be careful!

Limitations

As this is just the beginning, here are current limitations:

Earnings is simple calculation, but to keep it simple, we need to assume that there is only one currency. In case of international buyings, calculation of earnings won't be trivial. One currency is guaranteed by having a discount related to one region which can have only one currency.
For simplicity - affiliate discount cannot be edited. It means that if you want to reset earnings (e.g. when you pay your customer), then you need to delete affiliate discount and create new one. For some scenarios it can be even a better choice, for instance when your discount expired and you would like to create new one.
Admin UI widget is very simple - it might not cover all corner case in terms of validation of fields. One of the reason is that we still do not have experience in HTML/CSS. The other reason is that we are using basic stuff from @medusajs/ui, which is heavily limited. If @medusajs/ui will be improved, then improvements could be ported here.
The only commission type which is now supported is "percentage". If there will be interest about this plugin, then it might be improved.

TODO

[] Tests

[] Limit limitations :)

[] Develop full affiliate marketing - in case of interest, please contact.

Contribution

Contributions are welcome and they are greatly appreciated!

License

MIT

RSC-Labs/medusa-affiliate-discount