If you, as the inviter, select Both Credit by Inviter, Both Credit by Accepter or Self-Paid Credit by Inviter & Accepter as the credit payment option, you must ensure that both you and the accepter has sufficient connection credits to pay with.
If either of you does not have enough credits, a notification will appear indicating that you are unable to send the invitation to complete the connection. In such cases, you will need to choose the most suitable payment option that fits the current situation.