You need to release a different API key for accepting payment and making payouts
Payment API key
1. Go to the Business tab
2. Then go to the Merchants section
3. Click on the Create merchant button
4. Select a name for your merchant, and click on the Create merchant button
5. After selecting a name, go to the merchant's settings
6. Or open the Settings section in your merchant's tab
7. Click on the Leave a request button
8. Enter your website URL and click the Submit button
9. Confirm the domain using one of the following methods
10. Wait for the merchant's moderation
11. After successful moderation, you will be able to copy or regenerate the API key for payments, as well as copy the merchant ID in the Settings tab in your merchant account.
Payout API key
1. Open the Settings section of your personal account
2. Bind two-factor authentication if you haven't already done it
3. Go to the Settings-API
4. Generate - Payout key (Remember withdrawals will be temporarily blocked for 24 hour after generate new payout API key)