I am trying to update contact record in Salesforce via API call. I got the access token first by providing username, password, consumer key, consumer secret, grant_type. Then I used the access token and made the second call which is the actual API call to update contact.
My question is is it possible to update contact/get access token just with username, password without really providing the consumer key and consumer secret or we definitely need consumer key and consumer secret to get access token/update a record in Salesforce.
This is the API I am trying to access: