I am not a developer and I was asked by my developer to provide him with API Key. I came on the site and generate one but i didnt complete the field for api redirect url with OAuth 2.0. will my API key works wthout it or I should do it again? but have no idea about it.
Can you help?
You most likely won't need a redirect uri--you just need to put some value in for it. If you generated your API Key, your API Key will work.
If your developer does want to set up an OAuth2 flow, they may need to have you edit the redirect uri by going to the same link you went to in order to generate the API Key. They should be able to let you know what value they want entered for the redirect uri in that case.
API Support Specialist