ReinstatePolicy(ReinstatePolicyInput, policyId)

// Create and populate the ReinstatePolicyInputRepresentation object
ConnectApi.ReinstatePolicyInputRepresentation policyInput = new ConnectApi.ReinstatePolicyInputRepresentation();

// Populate fields for InsurancePolicyInputRepresentation
ConnectApi.InsurancePolicyInputRepresentation insurancePolicy = new ConnectApi.InsurancePolicyInputRepresentation();
insurancePolicy.policyName = 'Health Insurance Policy Reinstated';
insurancePolicy.policyNumber = 'HIPE12';

// Create the list that will hold the AdditionalFieldsMapValue wrappers.
List<ConnectApi.AdditionalFieldsMapValue> additionalFieldsValueList = new List<ConnectApi.AdditionalFieldsMapValue>();

// 1. Create the map containing the actual field data for ONE item.
Map<String, Object> dataForFirstMapValue = new Map<String, Object>();
dataForFirstMapValue.put('instanceKey', 'AutoSilver'); // Example key/value from your JSON structure
Map<String, Object> innerFieldsMap = new Map<String, Object>();
innerFieldsMap.put('Currency__c', '4456'); // Example inner field value
dataForFirstMapValue.put('fields', innerFieldsMap); // Put the inner fields map here

// 2. Create an instance of the AdditionalFieldsMapValue wrapper for this item.
ConnectApi.AdditionalFieldsMapValue firstMapValueWrapper = new ConnectApi.AdditionalFieldsMapValue();

// 3. Assign the map data (created in step 1) to the *correct property* on the wrapper instance.
firstMapValueWrapper.additionalFieldsMapValue = dataForFirstMapValue;


// 4. Add the populated wrapper instance to the list.
additionalFieldsValueList.add(firstMapValueWrapper);

// --- End of Populating the First Item ---


// --- If you need more items in the list, repeat steps 1-4 for each ---

// Assign the populated additional object to the policyInput
policyInput.additionalFields = additionalFieldsValueList;


policyInput.insurancePolicy = insurancePolicy;

// Optionally populate InsurancePolicyTransactionInputRepresentation
ConnectApi.InsurancePolicyTransactionInputRepresentation transactionRecord = new ConnectApi.InsurancePolicyTransactionInputRepresentation();
policyInput.transactionRecord = transactionRecord;

// Optionally set the effective date
// policyInput.effectiveDate = '2025-06-01';

try {
    // Call the Connect API directly
    ConnectApi.PolicyOutputRepresentation policyData =
        ConnectApi.InsurancePolicyAdminFamily.reinstatePolicy(policyInput, '0YTxx00000000MbGAI');

    // Output the policy data to the debug log
    System.debug('Policy reinstated successfully: ' + JSON.serializePretty(policyData));
} catch (Exception e) {
    // Log the error
    System.debug('Error while reinstating policy: ' + e.getMessage());
}