[مغلق] WPML credits

Hi, we've created a website for a client, they want to use the automatic translations from english to arabic. The client offered themselves to pay for 40K credits but the site is assigned with our account, is it possible for them to buy those credits and assign them to the site or our account and then we move them into the site? Or the only option for them to buy credits for the site is the pay-as-you go system?
Regards,
Josep