I've just purchased a standard package and generated around 4 or 5 videos that i did not like. But the i was advised that i dont have enough credits and i'm getting this notice as well. " 400 bad request REQUEST HEADER or COOKIE TOO LARGE"
Thanks for reaching out, I’m really sorry to hear that the videos didn’t turn out the way you hoped. That’s definitely not the experience we want you to have. The link will help you generate better prompts. Totally understand how frustrating that can be, especially when you're still exploring what works best for your needs.
The number of credits consumed in a generation is documented on this page: Generative credits FAQ, and specifically this table.
Regarding the 400 error, could you try using another browser.