How to use OpenAi api key in Free Trail

I want to use openai api key to recommend books directly to users, but i am using free trial version of openai when i am implemntng code using api key i am getting error. quota is full check the billing detials but i havenot set any pyments details on my open ai acoount.
Please tell me how to use openai api without setup payment method

you would be better off making a book page called “YOUR_RECAMEMENDED_BOOKS” HTML have it run off google just convert the books to pdf i have an exsample on my page and can help u with it if u want?