How much is the subscription for ChatGPT?

Could you please clarify the pricing structure for ChatGPT's subscription service? Is there a monthly fee, an annual subscription, or perhaps a one-time payment option? Are there any discounts available for long-term users or bulk purchases? Additionally, are there any hidden fees or additional costs that potential subscribers should be aware of? Lastly, is there a free trial period available to test the service before committing to a subscription?