Hi i try to use drupal 7 commerce paypal WPS payment method but my store use BGN - Bulgarian lev currency and when i try to checkout my order with paypal 30BGN in paypal are 30USD. How to fix this problem?
The PayPal WPS (Payments Standard) module only supports the currencies identified in Paypal's API documentation https://developer.paypal.com/docs/integration/direct/rest/currency-codes/.
Since BGN isn't on the list, it falls back to USD. You can either: a) patch the PayPal module to support payment transactions in BGN b) use the Commerce Multicurrency module [https://www.drupal.org/project/commerce_multicurrency] to get an actual conversion rate between BGN and a PayPal supported currency you want to transact in.