You need to deploy the Confirmation of Funds in Funds API in <WSO2_OB_APIM_HOME>/repository/resources/finance/apis/openbanking.org.uk/FundsConfirmation/3.1.1/funds-confirmation-swagger.yaml file. To deploy APIs for WSO2 Open Banking UK, see Deploying APIs for UK.
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If you have already deployed v3.1 APIs:
According to Open Banking Implementation Entity (OBIE), the v3.1 and v3.1.1 APIs have the same context values. Therefore, if you have already deployed v3.1 APIs, the v3.1.1 APIs cannot be deployed as new versions of existing APIs. You have to update the swagger file content.