Only a credit card can be used to pay for the services, unless agreed otherwise. The client must provide their credit card information to sign a contract and use services included in a paid package. If the client has used free services and has not provided credit card information upon signing the contract, then the client must provide credit card information to use paid services. The service provider checks the information and validity of the credit card immediately after receiving the information, and after this the credit card is used to pay for services consumed automatically. The client has the right to submit several credit cards, in which case they must select one default credit card which is used in first order for automatic payment. If an automatic payment from the default credit card fails, then the service provider has the right to withdraw the payment from another credit card of the client.