According to the Terms and Conditions, you need to review your vendor before claiming your cashback.
When you haven't received the product or service from the vendor, you can review your vendor based on some aspects that you could temporarily scale, such as :
- How prompt your vendor's responses are?
- How professional they treat you as a client?
- Variations of the products / services they offer.
Don't worry, you can edit your review in the future as per needed.