When affiliates apply to your program, you can give them the option of choosing a coupon code to use in their promotions. If you accept the affiliate into your network, the coupon code will be available to them as a conversion trigger, unique to them.
You can create this option by adding custom form fields to your registration page:
Navigate to Channels > Affiliate Registration Page, and click on Custom Form Fields link at left.
Click Add Custom Field.
In the pop-up, set Field mapping to Auto Conversion Trigger (Coupon).
This allows the field to be registered as a coupon code conversion trigger.
Enter a field label and type, and indicate if the field should be required.
To see what your registration page looks like with the new field, go to Dashboard > Affiliate Signup.
Shopify Users Only: You can have coupon codes created automatically in your store: Go to Account > Settings > Shopify, and fill in the Shopify Discount Code Creation portion.
Note: If you set Auto Approve Affiliates to YES for an offer, coupon codes will automatically be created for new affiliates upon registration.