I'm trying to connect WA with YM Careers for OAuth SSO Implementation.

They asked for the below information, and I think I got most, but there are some things I'm not sure on. I should also add I'm not a programmer and trying to figure this out.

In the WA information it sounds like I might have to create an API, but not really sure if I do, and if so how I would even do that. Any assistance or guidance would be appreciated.
WA Website I've been trying to follow: https://gethelp.wildapricot.com/en/articles/200

Auth URL:
I got this.

Token URL:
I think it is this?: https://oauth.wildapricot.org/auth/token
POST

Profile URL:
I also have this figured out

Parameters: Access Token:
I'm a little unsure on this, but I think maybe it is...
POST https://oauth.wildapricot.org/auth/token
Authorization: Basic Y2xpZW50X2lkOmNsaWVudF9wYXNzd29yZA== granttype=authorizationcode&code=09827394752790347&clientid=CLIENTID&redirecturi=http://callback.yourdomain.com&scope=contactsme

Location:
Header

Required – True or False
I'm not sure what this should be.

Permission Scope:
contacts_me

Grant Type:
Authorization_code