How to apply coupon code?

Sometimes I cant apply a coupon code. I submitted the code but they didnt tell me the code was usable or not. How to apply a coupon? or:Sometimes I c

Sometimes I can't apply a coupon code. I submitted the code but they didn't tell me the code was usable or not. How to apply a coupon?

or:Sometimes I can't apply a coupon code. I submitted the code but they didn't tell me the code was usable or not. How to apply a coupon?

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