Problem creating Payment Plugin for credit card processing - Implementation of ExportSettings()

I’m implementing  PX.CCProcessingBase.Interfaces.V2.ICCProcessingPlugin
As per the documentation and description here

https://help.acumatica.com/Wiki/(W(4))/ShowWiki.aspx?pageid=927a2a44-ebe5-4c98-a277-7027f4e073a0
and the definition here

https://help.acumatica.com/(W(8))/Help?ScreenId=ShowWiki&pageid=8e6c3962-2ae0-63b9-ab25-2e32abeb701f

When I try to implement the function

IEnumerable<SettingsDetail> ExportSettings()I’m getting the below error, although I implemented it to return IEnumerable<SettingsDetail>

error CS0738: 'CyberSourcePaymentPlugin' does not implement interface member 'ICCProcessingPlugin.ExportSettings()'. 'CyberSourcePaymentPlugin.ExportSettings()' cannot implement 'ICCProcessingPlugin.ExportSettings()' because it does not have the matching return type of 'IEnumerable<SettingsDetail>'.

Not sure why I’m getting this error, here is my implmentation

public IEnumerable<SettingsDetail> ExportSettings()
        {

            // Create a list of SettingsDetail objects
            List<SettingsDetail> settings = new List<SettingsDetail>
            {
                new SettingsDetail
                {
                    SettingName = "MerchantId",
                    SettingValue = "yourMerchantId" // Replace with actual value
                },
                new SettingsDetail
                {
                    SettingName = "ApiKey",
                    SettingValue = "yourApiKey" // Replace with actual value
                },
                new SettingsDetail
                {
                    SettingName = "ApiSecret",
                    SettingValue = "yourApiSecret" // Replace with actual value
                },
                new SettingsDetail
                {
                    SettingName = "Endpoint",
                    SettingValue = "https://api.cybersource.com" // Replace with actual endpoint
                }
            };

            return settings;
        }

And the settings details class definition is

    public class SettingsDetail
    {
        public string SettingName { get; set; }
        public string SettingValue { get; set; }
    }

hope anyone can advise, thanks