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Then use this to initialize the validation."]},{"$$mdtype":"Tag","name":"Tabs","attributes":{"size":"medium"},"children":[{"$$mdtype":"Tag","name":"div","attributes":{"label":"Kotlin","disable":false},"children":[{"$$mdtype":"Tag","name":"CodeBlock","attributes":{"file":"./code/validation/card/card-validation.kt","language":"java","header":{"controls":{"copy":{}}},"lang":"java","source":"package com.worldpay.access.checkout.sample.code\n\n// android library imports omitted\n\nimport com.worldpay.access.checkout.client.validation.AccessCheckoutValidationInitialiser\nimport com.worldpay.access.checkout.client.validation.config.CardValidationConfig\n\nclass MainActivity : AppCompatActivity() {\n\n    private val baseUrl = \"TARGET_BASE_URL\"\n\n    // other fields omitted\n\n    override fun onCreate(savedInstanceState: Bundle?) {\n        super.onCreate(savedInstanceState)\n\n        val panAccessCheckoutView: AccessCheckoutEditText= findViewById<AccessCheckoutEditText>(R.id.card_flow_text_pan)\n        val cvcAccessCheckoutView: AccessCheckoutEditText = findViewById<AccessCheckoutEditText>(R.id.card_flow_text_cvc)\n        val expiryDateAccessCheckoutView: AccessCheckoutEditText = findViewById<AccessCheckoutEditText>(R.id.card_flow_text_expiryDate)\n\n        // other view references omitted\n\n        val cardValidationListener = CardValidationListener()\n\n        val cardValidationConfig = CardValidationConfig.Builder()\n                .baseUrl(baseUrl)\n                .pan(panAccessCheckoutView)\n                .expiryDate(expiryDateAccessCheckoutView)\n                .cvc(cvcAccessCheckoutView)\n                .validationListener(cardValidationListener)\n                .lifecycleOwner(this)\n                .build()\n\n        AccessCheckoutValidationInitialiser.initialise(cardValidationConfig)\n\n        //TODO: generate session here\n    }\n\n}\n"},"children":[]}]},{"$$mdtype":"Tag","name":"div","attributes":{"label":"Java","disable":false},"children":[{"$$mdtype":"Tag","name":"CodeBlock","attributes":{"file":"./code/validation/card/card-validation.java","language":"java","header":{"controls":{"copy":{}}},"lang":"java","source":"package com.worldpay.access.checkout.sample.code\n\n// android library imports omitted\n\nimport com.worldpay.access.checkout.client.validation.AccessCheckoutValidationInitialiser;\nimport com.worldpay.access.checkout.client.validation.config.CardValidationConfig;\nimport com.worldpay.access.checkout.client.validation.listener.AccessCheckoutCardValidationListener;\n\npublic class MainActivity extends AppCompatActivity {\n\n    private String baseUrl = \"TARGET_BASE_URL\";\n\n    // other fields omitted\n\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n\n        AccessCheckoutEditText panAccessCheckoutView = findViewById<AccessCheckoutEditText>(R.id.card_flow_text_pan);\n        AccessCheckoutEditText cvcAccessCheckoutView = findViewById<AccessCheckoutEditText>(R.id.card_flow_text_cvc);\n        AccessCheckoutEditText expiryDateAccessCheckoutView = findViewById<AccessCheckoutEditText>(R.id.card_flow_text_expiryDate);\n\n        // other view references omitted\n\n        AccessCheckoutCardValidationListener cardValidationListener = CardValidationListener();\n\n        CardValidationConfig cardValidationConfig = CardValidationConfig.Builder()\n                .baseUrl(baseUrl)\n                .pan(panAccessCheckoutView)\n                .expiryDate(expiryDateAccessCheckoutView)\n                .cvc(cvcAccessCheckoutView)\n                .validationListener(cardValidationListener)\n                .lifecycleOwner(this)\n                .build();\n\n        AccessCheckoutValidationInitialiser.initialise(cardValidationConfig);\n\n        //TODO: generate session here\n    }\n\n}\n"},"children":[]}]}]},{"$$mdtype":"Tag","name":"Heading","attributes":{"level":4,"id":"card-validation-rules","__idx":5},"children":["Card validation rules"]},{"$$mdtype":"Tag","name":"p","attributes":{},"children":["The validation logic in the SDK, is based off a set of default rules for any card type. 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