If you're using cashback as the commonly known finance term, i.e, cashback guarantee, then you will use the two words without the space. On the other hand, if you're using them as two separate words, like 'give me my cash back' then there's a space. Find more at Writers' Order.
Correct way to write cashback
in English Grammar
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If you're using cashback as the commonly known finance term, i.e, cashback guarantee, then you will use the two words without the space. On the other hand, if you're using them as two separate words, like 'give me my cash back' then there's a space. Find more at Writers' Order.