SDK Configuration
This section describes how the Netcetera Android 3DS SDK should be configured.
Directory Server Configuration
When a transaction is initiated, the SDK gets the information about the Directory Server that will participate in the message flow. With that, the SDK determines which DS public key should be used for data encryption and which DS logo should be shown.
The SDK uses the DS public key and the DS logo. These are configured in the ConfigParameters in Initialization.
The encryption key or certificate and the root certificate can be obtained from each scheme respectively.
Following are the steps for the DS configuration:
- Schemes - Which schemes can be used.
- DS IDs - DS IDs that belong to a certain scheme.
- Schemes public key - Public key for each scheme used for encryption of the device data.
- Schemes root public key - Public key for each scheme used for verification of the certificate chain in the
acsSignedContentduring a challenge flow. - Scheme logo Resource ID - Drawable Resource ID for each scheme that will be used as logo.
- Scheme dark logo Resource ID - Drawable Resource ID for each scheme that will be used as dark mode logo.
Some of the values can be omitted, please check Pre-configured Directory Servers for the pre-configured values that will be used instead.
Note: If public keys are provided, the keys can be either EC or RSA in PEM format. If certificates are provided, they need to be in the X.509 standard in either PEM or DER format.
Configuration with ConfigurationBuilder (Recommended)
The ConfigurationBuilder is a feature that is not defined in the specification, but has been provided by the Netcetera Android 3DS SDK to allow easier configuration of the ConfigParameters. It provides ease of use methods to set the required fields for new or existing schemes, as to prevent possible misconfigurations.
Configuring schemes
To define the scheme, use the ConfigurationBuilder.configureScheme(...) with the following arguments
| Argument | Value |
|---|---|
schemeConfiguration | The configuration of the scheme |
SchemeConfiguration
The Netcetera Android 3DS SDK provides a utility class to help with the configuration of the scheme. To define a new scheme use SchemeConfiguration.newSchemeConfiguration... with the following arguments:
| Argument | Value |
|---|---|
schemeName | The name of the current scheme |
schemeIds | List containing the DS ids for the scheme. |
schemeLogo | String value of Drawable Resource ID for the standard logo |
schemeLogoDark | String value of Drawable Resource ID for the dark logo |
encryptionPublicKey | ASN.1 encoding of the public key |
rootPublicKey | ASN.1 encoding of the public root key |
certificatePath | The path of the certificate (DER/PEM) in Base64 encoded format placed in the "assets" directory. |
Example:
The utility class also includes the option to modify a pre-configured scheme. For that purpose use SchemeConfiguration.{DSName}SchemeConfiguration..., with the aforementioned arguments, where {DSName} is the name of the scheme corresponding with a directory server from Pre-configured Directory Servers. The argument values that won't be specified shall be taken from Pre-configured Directory Servers.
Example:
Configuration with ConfigParameters
Configuring Schemes Directory Servers
To define the scheme DS, use the ConfigParameters.addParam(...) with the following arguments:
| Argument | Value |
|---|---|
group | null |
paramName | "schema_names" |
paramValue | Comma separated values of schemes. |
Example:
Configuring DS IDs
To define the DS IDs that belong to certain scheme, use the ConfigParameters.addParam(...) with the following arguments:
| Argument | Value |
|---|---|
group | "schema_ds_ids" |
paramName | The name of the scheme to define for. |
paramValue | Comma separated values of each DS id for the scheme. |
The 3DS Requestor App uses the Cardholder Account Number and optionally other cardholder information to identify the DS ID. A DS ID is the Scheme's Card RID (Registered application provider identifier). The identifier, usually 5 bytes in length, is issued by the ISO/IEC 7816-5 registration authority and is used to address an application in the card. For example, an RID could be: A000000003. Please refer to the configuration for more RID values.
Example:
Configuring DS Public Keys
To define the public key that will be used for certain scheme, use the ConfigParameters.addParam(...) with the following arguments:
| Argument | Value |
|---|---|
group | "schema_public_key" |
paramName | The name of the scheme to define for. |
paramValue | ASN.1 encoding of the public key or the certificate (DER/PEM) in Base64 encoded format. |
Example:
Configuring DS Root Public Keys
To define the root public key that will be used for certain scheme, use the ConfigParameters.addParam(...) with the following arguments:
| Argument | Value |
|---|---|
group | "schema_root_public_key" |
paramName | The name of the scheme to define for. |
paramValue | ASN.1 encoding of the public key or the certificate (DER/PEM) in Base64 encoded format. |
Note: To ensure a higher percentage of successful transactions, in the event where the configured root certificate cannot verify the acsSignedContent, the Netcetera 3DS SDK will try to use the corresponding Pre-configured DS Root Public Key instead.
Example:
Configuring Logos
A scheme can have 2 logos configured - standard and dark logo. The standard logo is mandatory for each scheme and therefore must be present either in the 3DS SDK preconfigured data or configured by the Requestor Application. On the other hand, the dark logo is optional and will only be used in case the Requestor Application enables dark mode on the 3DS SDK and necessary system conditions are met. If the 3DS SDK needs to use a dark logo that is missing, it will use the standard logo displayed under white surface as a fallback instead.
To define the standard logo that will be used for a certain scheme, use the ConfigParameters.addParam(...) with the following arguments:
| Argument | Value |
|---|---|
group | "schema_logo" |
paramName | The name of the scheme to define for. |
paramValue | String value of Drawable Resource ID. |
To define the dark logo that will be used for a certain scheme, use the ConfigParameters.addParam(...) with the following arguments:
| Argument | Value |
|---|---|
group | "schema_logo_dark" |
paramName | The name of the scheme to define for. |
paramValue | String value of Drawable Resource ID. |
Example:
Pre-configured Directory Servers
The Netcetera Android 3DS SDK comes bundled with configuration for the following directory servers, listed in the tables below.
Pre-configured certificates:
3ds2.directory.mastercard.com Expiry: 15.06.2024 | PRD MasterCard Identity Check Root CA Expiry: 15.07.2030 | ||
3ds2.rsa.encryption.visa.com Expiry: 22.08.2024 | Visa Public RSA Root CA Expiry: 15.03.2041 | ||
sdk.safekey.encryptkey.com Expiry: 19.08.2023 | American Express Private Certification Authority Expiry: 11.08.2029 | ||
Discover SDK Key | ProtectBuy Root Expiry: 03.02.2027 | ||
ds2apr.jcb-tds.com Expiry: 03.03.2051 | JCB DS Root CA EMV 3-D Secure Expiry: 09.01.2036 | ||
银联国际有限公司 Expiry: 02.08.2022 | CFCA ACS CA Expiry: 28.09.2035 | ||
CartesBancaires SDK Key | Root 3DS CB CA Expiry: 31.07.2048 |
Pre-configured logos:
R.drawable.ds_logo_mastercard | R.drawable.ds_logo_mastercard_dark | |
R.drawable.ds_logo_visa | R.drawable.ds_logo_visa | |
R.drawable.ds_logo_amex | R.drawable.ds_logo_amex_dark | |
R.drawable.ds_logo_diners | R.drawable.ds_logo_diners | |
R.drawable.ds_logo_jcb | R.drawable.ds_logo_jcb | |
R.drawable.ds_logo_mir | R.drawable.ds_logo_mir | |
R.drawable.ds_logo_union | R.drawable.ds_logo_union | |
R.drawable.ds_logo_cb | R.drawable.ds_logo_cb |
The binding between the configuration and the pre-configured values is done with the RID value of the Directory Server.
The configuration has precedence over pre-configured values and overwrites them i.e. if a configuration is provided for a parameter, that one will be used, instead of the pre-configured one.
Note: The pre-configured DS Public Key and DS Root Public Key serve for convenience, while the integrators have to verify their compatibility to the Directory Server. The integrators are encouraged to complete the configuration.
DS RID Values
The Netcetera Android 3DS SDK has a utility API DsRidValues that contains the DS RIDs for the SDK Preconfigured Schemes.
UI Customization
The Netcetera Android 3DS SDK supports customization of the UI elements that are being shown by the SDK itself. For this purpose UiCustomization is used.
Additionally, Netcetera Android 3DS SDK adds support for the system wide dark mode available from Android 10. The Requestor application can enable this feature by calling the UICustomization.supportDarkMode(true) method on the UI customization object used for the SDK initialization.
When enabled, the Netcetera Android 3DS SDK will follow the current android system theme as set in the system settings. To accommodate the additional styling needs of the dark mode, the Netcetera Android 3DS SDK extends the EMVCo protocol with additional methods listed bellow.
| Class | Method | Description |
|---|---|---|
UiCustomization | supportDarkMode(boolean supported) | Enables or disables the support for dark mode |
Customization | setDarkTextColor(String hexColorCode) | Sets the dark mode text color as hex string value |
ButtonCustomization | setDarkBackgroundColor(String hexColorCode) | Sets the dark mode background color as hex string value |
ToolbarCustomization | setDarkBackgroundColor(String hexColorCode) | Sets the dark mode background color as hex string value |
LabelCustomization | setHeadingDarkTextColor(String hexColorCode) | Sets the dark mode heading text color as hex string value |
TextBoxCustomization | setDarkBorderColor(String hexColorCode) | Sets the dark mode border color as hex string value |
Example:
Note: The "dark" customization will only be applied when the Requestor application enables this feature, Android version is 10 or higher and dark mode is active in the system settings.
For detailed information of the UiCustomization API and how to be used, refer to 4.5 in the EMVCo 3DS SDK Specification.
Accessibility Recommendation
The Netcetera Android 3DS SDK follows the latest guidelines and best practices defined by Google for building accessible apps.
If a custom UiCustomization is provided to the 3DS SDK, we recommend that a tool such as the Accessibility Scanner is used to check for any accessibility improvements on the custom UI.
Restricted Device Info Parameters Configuration
Configuration with ConfigurationBuilder (Recommended)
To define which device info parameters shall be considered as restricted and thus not collected, use the ConfigurationBuilder.restrictedParameters(...) with the following arguments:
| Argument | Value |
|---|---|
restrictedParameters | List containing the IDs of the device info parameters. |
Example:
List of device info parameters and their corresponding IDs can be found at EMVCo 3DS SDK Device Info. If a entry in the restricted device info parameters configuration has value that doesn't correspond to any predefined device info parameter ID, an InvalidInputException is thrown.
Configuration with ConfigParameters
To define which device info parameters shall be considered as restricted and thus not collected, use the ConfigParameters.addParam(...) with the following arguments:
| Argument | Value |
|---|---|
group | null |
paramName | "restricted_device_info_parameters" |
paramValue | Comma separated values of IDs of the device info parameters. |
Example:
Weak Validation of Challenge Response
The Netcetera Android 3DS SDK provides a method that loosens the level of validation of the challenge response parameters received by the ACS. If enabled, the weak validation removes the mandatory status and the string length validation of several challenge response parameters. By default, weak validation is disabled, and it is recommended not to be enabled. This configuration should only be used temporary and preferably while developing or testing, when SDK integrators have problems with the ACS CRes returning values not reflecting the latest EMVCo bulletins rules that the SDK supports. In that case the end users are blocked and cannot complete a transaction. If such problems arise please inform the issuers which version of the SDK you are using and what is the latest bulletin supported by the SDK.
Note: By enabling weak validation, the Netcetera Android 3DS SDK will no longer be compliant with the latest bulletin of the EMVCo Protocol and Core Functions Specification. If any legal actions or consequences arise, the responsibility for using this feature falls on the integrator of the Netcetera Android 3DS SDK.
Configuration with ConfigurationBuilder (Recommended)
To enable or disable the weak validation, call ConfigurationBuilder.useWeakDataElementValidation(...) with the following arguments:
| Argument | Value |
|---|---|
useWeakValidation | true to enable, false(default) to disable the weak validation |
Example:
Configuration with ConfigParameters
To enable or disable the weak validation, call ConfigParameters.addParam(...) with the following arguments:
| Argument | Value |
|---|---|
group | null |
paramName | "weak_validation" |
paramValue | Boolean value as string, such as "true" or "false" |
Example:
Logging Configuration
The Netcetera Android 3DS SDK uses SLF4J for logging purposes, logging only messages on level WARN and ERROR. The logging of these log levels can be configured by using any logging implementation on top of SLF4J.
Sample implementation that uses logback-android can be found in the guide for the demo reference application and the source code itself.
Permissions
This section describes which Android permissions are required to be granted and which are optional.
| Permission | Mandatory | Description |
|---|---|---|
android.permission.INTERNET | Yes | Required for communication with the ACS in Challenge Flow. Must be permitted before Starting of Challenge Flow. |
android.permission.ACCESS_COARSE_LOCATION | No | Required for collecting the device coarse location that will be provided as device info parameter. Should be permitted before Initialization. |
android.permission.ACCESS_FINE_LOCATION | No | Required for collecting the device fine location that will be provided as device info parameter. Should be permitted before Initialization. |
android.permissions.ACCESS_NETWORK_STATE | No | Required for collecting device's IP Address that will be provided as device info parameter. Should be permitted before Initialization. |
android.permission.BLUETOOTH | No | Required for collecting bluetooth hardware info that will be provided as device info parameter. Should be permitted before Initialization. |
android.permission.READ_PHONE_STATE | No | Required for collecting Telephony information that will be provided as device info parameters. Should be permitted before Initialization. |
android.permission.SEND_SMS | No | Required for collecting Telephony information that will be provided as device info parameters. Should be permitted before Initialization. |
android.permission.ACCESS_WIFI_STATE | No | Required for collecting WiFi and Network related information that will be provided as device info parameters. Should be permitted before Initialization. |
Scheme Specific Requirements
This section lists additional requirements that the integrator of the Netcetera Android 3DS SDK needs to fulfill in order to be compliant with the requirements of a specific scheme.
Amex
| Type | Description | EMVCo Requirement | Amex | Enforceability |
|---|---|---|---|---|
| Modification | Maximum duration of the challenge process provided in Transaction.doChallenge(..., timeout) | Minimum 5 minutes | Recommended 10 minutes | Recommended |