Buyed is not recognized by dictionaries as a word in standard English. The simple past tense form of the verb buy is bought, and the past participle is also bought. Buy is an irregular verb, so it doesn’t follow the regular pattern for forming the different tenses.
Bought and brought are commonly confused, but they are completely different words and cannot be used interchangeably.
You can use the QuillBot Grammar Checker to ensure you’re using the past tense of “buy” correctly.