OpenAIのAPIエラー： 429 You exceeded your current quota と言われた場合の解決策

API Error: Status Code 429, 
{ 
"error": 
	{ 
	"message": "You exceeded your current quota, please check your plan and billing details. For more information on this error, read the docs: https://platform.openai.com/docs/guides/error-codes/api-errors.", 
	"type": "insufficient_quota", 
	"param": null, 
	"code": "insufficient_quota" 
	} 
}