To gather useful information from the SDK, you can either use default SDK Logger or implement and assign your own logger that the SDK will use to send log messages.
SWIFT
public protocol PrimerLogger {
    var logLevel: LogLevel { get set }
    func log(level: LogLevel, message: String, userInfo: Encodable?, metadata: PrimerLogMetadata)
}
Log messages are assigned one of these levels: debug, info, warning, error, and none. The default logger has a log level of .none. This allows simple and powerful filtering of log messages so that you can, for example, print debug messages to the local console and send error messages to an external aggregator.
The default behaviour of the logger is not to send any logs at all unless the DEBUG compilation symbol is present - this avoids any PCI or PII being logged in production reporting tools.

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Implementing your own custom logger

To implement a logger, create a class or struct that implements PrimerLogger, like so:
SWIFT
class ExampleLogger: PrimerLogger {

    private let osLogger = os.Logger()

    var logLevel: LogLevel = .debug

    func log(level: PrimerSDK.LogLevel, message: String, userInfo: Encodable?, metadata: PrimerSDK.PrimerLogMetadata) {
        switch level {
        case .debug:
            osLogger.debug("\(message)")
        case .info:
            osLogger.info("\(message)")
        case .warning:
            osLogger.warning("\(message)")
        case .error:
            osLogger.error("\(message)")
        }
        /* ... Your custom logging logic here ... */
    }
}
Then assign an instance to the logger property:
SWIFT
PrimerLogging.shared.logger = ExampleLogger()
If you want to change the logs that you receive based on log level, set the logLevel property like so:
SWIFT
// Only `warning` and `error` level logs will be sent to your logger
PrimerLogging.shared.logLevel = .warning
If you don’t want to receive any logs, set the log level to .none.

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Default SDK logger

The SDK provides a default logger that will print to the Xcode and/or macOS console using either OSLogger (if available) or print. Note that the default logger has a log level of none, so it won’t send any logs at all unless you assign a different level. You can easily assign .debug or any other log level to the default logger by simply calling:
SWIFT
PrimerLogging.logger.logLevel = .debug

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Logging Parameters

SWIFT
func log(level: PrimerSDK.LogLevel, message: String, userInfo: Encodable?, metadata: PrimerSDK.PrimerLogMetadata)