Code review comment: Ok, I'll need to update the rhoas operator and do a new release. Do you mind if we remove this property in a future pr, or are you planning on removing support for it in the very near (this calendar year) future.

Code under review:
public Optional<ServiceBindingConfigSource> convert(List<ServiceBinding> serviceBindings) {
        var matchingByType = ServiceBinding.singleMatchingByType("serviceregistry", serviceBindings);
        Config config = ConfigProvider.getConfig();
        if (matchingByType.isEmpty()) {
            return Optional.empty();
        }

        var binding = matchingByType.get();

        List<String> channels = extractChannels(config);

        Map<String, String> properties = new HashMap<>();

        String registryUrl = binding.getProperties().get("registryUrl");
        if (registryUrl == null) {
            registryUrl = binding.getProperties().get("registryurl");
        }
        if (registryUrl != null) {
            properties.put("mp.messaging.connector.smallrye-kafka.apicurio.registry.url", registryUrl);
        }

        for (String channel : channels) {

            String prefix = channel;

            String oAuthHost = binding.getProperties().get("oauthServerUrl");
            if (oAuthHost == null) {
                oAuthHost = binding.getProperties().get("oauthserverurl");
            }
            if (oAuthHost != null) {
                properties.put(prefix + "apicurio.auth.service.url", oAuthHost);
            }

            String clientId = binding.getProperties().get("clientId");
            if (clientId == null) {
                clientId = binding.getProperties().get("clientid");
            }
            if (clientId != null) {
                properties.put(prefix + "apicurio.auth.client.id", clientId);
            }

            String clientSecret = binding.getProperties().get("clientSecret");
            if (clientSecret == null) {
                clientSecret = binding.getProperties().get("clientsecret");
            }
            if (clientSecret != null) {
                properties.put(prefix + "apicurio.auth.client.secret", clientSecret);
            }

            String realm = binding.getProperties().get("oauthRealm");
            if (realm == null) {
                realm = binding.getProperties().get("oauthRealm");
            }
            if (clientSecret != null) {
                properties.put(prefix + "apicurio.auth.realm", realm);
            }

            if (registryUrl != null) {
                properties.put(prefix + "apicurio.registry.url", registryUrl);
            }
        }

        return Optional.of(new ServiceBindingConfigSource("serviceregistry-k8s-service-binding-source", properties));
    }

Line commented on: String realm = binding.getProperties().get("oauthRealm");

Revised code:
public Optional<ServiceBindingConfigSource> convert(List<ServiceBinding> serviceBindings) {
        var matchingByType = ServiceBinding.singleMatchingByType("serviceregistry", serviceBindings);
        Config config = ConfigProvider.getConfig();
        if (matchingByType.isEmpty()) {
            return Optional.empty();
        }

        var binding = matchingByType.get();

        List<String> channels = extractChannels(config);

        Map<String, String> properties = new HashMap<>();

        String registryUrl = binding.getProperties().get("registryUrl");
        if (registryUrl == null) {
            registryUrl = binding.getProperties().get("registryurl");
        }
        if (registryUrl != null) {
            properties.put("kafka.apicurio.registry.url", registryUrl);
        }

        for (String channel : channels) {

            String prefix = channel;

            String oauthTokenUrl = binding.getProperties().get("oauthTokenUrl");
            if (oauthTokenUrl == null) {
                oauthTokenUrl = binding.getProperties().get("oauthtokenurl");
            }
            if (oauthTokenUrl != null) {
                properties.put(prefix + "apicurio.auth.service.token.endpoint", oauthTokenUrl);
            }

            String clientId = binding.getProperties().get("clientId");
            if (clientId == null) {
                clientId = binding.getProperties().get("clientid");
            }
            if (clientId != null) {
                properties.put(prefix + "apicurio.auth.client.id", clientId);
            }

            String clientSecret = binding.getProperties().get("clientSecret");
            if (clientSecret == null) {
                clientSecret = binding.getProperties().get("clientsecret");
            }
            if (clientSecret != null) {
                properties.put(prefix + "apicurio.auth.client.secret", clientSecret);
            }
            if (registryUrl != null) {
                properties.put(prefix + "apicurio.registry.url", registryUrl);
            }
        }

        return Optional.of(new ServiceBindingConfigSource("serviceregistry-k8s-service-binding-source", properties));
    }