To activate the “Calculate” button, you must complete the purchase information:
- Select the purchase currency, displaying the options.
- Enter the purchase value.
- Select the program you want to pay with.
![Amazon-Calculate EN](https://help.rewardsweb.com/hs-fs/hubfs/FAQs/Amazon/Amazon-Calculate%20EN.png?width=688&height=385&name=Amazon-Calculate%20EN.png)
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