Do I need to answer a message to charge and bill a chat conversation?

Yes, in order to be able to charge and bill a message you have received, you need to have first provided an answer.

Be mindful that people will be able to rate you after you finished your communication so if you don't provide good or timely answers, your overall score might be impacted.

Furthermore, depending on your rate per message, you might need to have a conversation of more than one text message to be able to bill the conversation (in order to reach the minimum amount to start the billing process). The minimum amount to be able to execute this billing process is shown when you click on the $ sign in any chat conversation.