Adyen - changed the Configuration level mapping between Adyen and Erply
Erply's Company level is not equivalent of Adyen's Account level, so Adyen's Account level API key is not appropriate to be used for Erply's Company level configurations
Erply's Warehouse level is equivalent of Adyen's Merchant level, so Adyen's Merchant level API key is appropriate to be used for Erply's Warehouse level configurations
This results in the need for each company to set and configure at least one Merchant level API key from Adyen and save it in every Erply Warehouse level configuration for Adyen Payment Integration