Problems

Problems

When using the Merchant Backend Configuration, most errors in the payment process will result in Problem responses from the backend. The SDK contains utilities for processing these in your application.

On Android, if any operation fails due to a Problem, the resulting exception will be of the type RequestProblemException, which allows access to the Problem object. Problem is a JVM representation of the Problem JSON response, allowing for easy access to standard fields. You are free to use Problem as-is for modeling your own problem types. The Merchant Backend Configuration further defines a subclass of Problem, MerchantBackendProblem, which is a sealed class containing all the problem types expected to occur with a Merchant Backend server. All problems reported by the Merchant Backenc Configuration are of this type, allowing you to use kotlin’s powerful when expression to handle the different errors:

Android

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when (problem) {
    is MerchantBackendProblem.Client.MobileSDK.Unauthorized ->
        handleUnauthorized()
    is MerchantBackendProblem.Client ->
        handleOtherClientError()
    is MerchantBackendProblem.Server.MobileSDK ->
        handleMerchantBackendError()
    is MerchantBackendProblem.Server.SwedbankPay.ConfigurationError ->
        handleConfigurationError()
    is MerchantBackendProblem.Server.SwedbankPay ->
        handleSwedbankPayError()
    else ->
        handleUnknownError()

}

On iOS, if any operation fails due to a Problem, the resultig error will be SwedbankPaySDK.MerchantBackendError.problem, and it will have the problem as an associated value, of type SwedbankPaySDK.Problem. SwedbankPaySDK.Problem is a enum with a similar structure to the Android MerchantBackendProblem, allowing for idiomatic error handling.

iOS

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if case SwedbankPaySDK.MerchantBackendError.problem(let problem) = error {
    switch problem {
    case .client(.mobileSDK(.unauthorized)):
        handleUnauthorized()
    case .client:
        handleOtherClientError()
    case .server(.mobileSDK):
        handleMerchantBackendError()
    case .server(.swedbankPay):
        handleSwedbankPayError()
    default:
        handleUnknownError()
    }
}