Partners need to select "Confidential" under the ‘OAuth Type’ field if they are using high criticality APIs. HDFC Bank classifies a few APIs as having high criticality, especially APIs that involve financial transactions. Partners are provided with user manuals that indicate whether OAuth is being used or not. However, most APIs have not been classified as high criticality APIs, and do not use OAuth. For such APIs, the value "None" needs to be chosen under OAuth Type.