1. Create a coupon data extension. Include the following fields in the data extension along with any additional fields you need:CouponCodeTransactionKeySubscriberKey
2. CouponCode
3. TransactionKey
4. SubscriberKey
5. Use an import definition to import the coupon codes, transaction keys, subscriber key, and any addition fields into the data extension.
6. Build your coupon. Include any needed elements and selectTransaction-Based.
7. Add the coupon in an email.
8. Create and start the triggered send email definition that includes the email containing your coupon.
9. Perform the triggered send via an API call, specifying the appropriate TransactionKey in the SOAP envelope.