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undefined in the case where the PAN changes from a detected to an undetected card brand\n  },\n\n  onPanValidChanged(isValid) {\n    // TODO: handle the pan validation result\n  },\n\n  onExpiryDateValidChanged(isValid) {\n    // TODO: handle the expiry date validation result\n  },\n\n  onCvcValidChanged(isValid) {\n    // TODO: handle the cvc validation result\n  },\n\n  onValidationSuccess() {\n    // TODO: handle the form when the validation is complete i.e. all fields are valid\n  },\n};\n"},"children":[]}]},{"$$mdtype":"Tag","name":"div","attributes":{"label":"TypeScript","disable":false},"children":[{"$$mdtype":"Tag","name":"CodeBlock","attributes":{"file":"./code/validation/card/implement-card-validation-event-listener.ts","language":"json","header":{"controls":{"copy":{}}},"lang":"json","source":"import {\n  ...\n  Brand,\n  CardValidationEventListener,\n} from '@worldpay/access-worldpay-checkout-react-native-sdk';\n\nconst validationEventListener: CardValidationEventListener = {\n  onCardBrandChanged(brand?: Brand): void {\n    // TODO: handle the card brand change\n    // brand is an object properties name and images\n    // name contains the name of one of the brands supported and detected by the SDK\n    // images is an array of objects where each object has a type (image/png or image/svg+xml) and a url property\n    // brand will be undefined in the case where the PAN changes from a detected to an undetected card brand\n  },\n\n  onPanValidChanged(isValid: boolean): void {\n    // TODO: handle the pan validation result\n  },\n\n  onExpiryDateValidChanged(isValid: boolean): void {\n    // TODO: handle the expiry date validation result\n  },\n\n  onCvcValidChanged(isValid: boolean): void {\n    // TODO: handle the cvc validation result\n  },\n\n  onValidationSuccess(): void {\n    // TODO: handle the form when the validation is complete i.e. all fields are valid\n  },\n};\n"},"children":[]}]}]},{"$$mdtype":"Tag","name":"Heading","attributes":{"level":4,"id":"methods","__idx":5},"children":["Methods"]},{"$$mdtype":"Tag","name":"div","attributes":{"className":"md-table-wrapper"},"children":[{"$$mdtype":"Tag","name":"table","attributes":{"className":"md"},"children":[{"$$mdtype":"Tag","name":"thead","attributes":{},"children":[{"$$mdtype":"Tag","name":"tr","attributes":{},"children":[{"$$mdtype":"Tag","name":"th","attributes":{"data-label":"Method"},"children":["Method"]},{"$$mdtype":"Tag","name":"th","attributes":{"data-label":"Description"},"children":["Description"]}]}]},{"$$mdtype":"Tag","name":"tbody","attributes":{},"children":[{"$$mdtype":"Tag","name":"tr","attributes":{},"children":[{"$$mdtype":"Tag","name":"td","attributes":{},"children":[{"$$mdtype":"Tag","name":"code","attributes":{},"children":["onCardBrandChanged"]}]},{"$$mdtype":"Tag","name":"td","attributes":{},"children":["This method is called with a card brand based on the details 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The card brand contains a ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["name"]}," as well as an array of ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["images"]},". If the card brand can't be identified, an ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["undefined"]}," brand is passed to the method.",{"$$mdtype":"Tag","name":"br","attributes":{},"children":[]},"You may want to use the ",{"$$mdtype":"Tag","name":"MarkdownLink","attributes":{"href":"https://access.worldpay.com/access-checkout/cardTypes.json"},"children":["array of images"]}," to display an icon for the identified card brand. Access Worldpay hosts both PNG and SVG versions of the supported card brands. You can use the icons right away and apply them to your UI."]}]},{"$$mdtype":"Tag","name":"tr","attributes":{},"children":[{"$$mdtype":"Tag","name":"td","attributes":{},"children":[{"$$mdtype":"Tag","name":"code","attributes":{},"children":["onPanValidChanged"]}]},{"$$mdtype":"Tag","name":"td","attributes":{},"children":["This method is called with the validity of the pan field. ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["isValid"]}," indicates whether the field is in a valid or invalid state."]}]},{"$$mdtype":"Tag","name":"tr","attributes":{},"children":[{"$$mdtype":"Tag","name":"td","attributes":{},"children":[{"$$mdtype":"Tag","name":"code","attributes":{},"children":["onExpiryDateValidChanged"]}]},{"$$mdtype":"Tag","name":"td","attributes":{},"children":["This method is called with the validity of the expiry date field. ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["isValid"]}," indicates whether the field is in a valid or invalid state."]}]},{"$$mdtype":"Tag","name":"tr","attributes":{},"children":[{"$$mdtype":"Tag","name":"td","attributes":{},"children":[{"$$mdtype":"Tag","name":"code","attributes":{},"children":["onCvcValidChanged"]}]},{"$$mdtype":"Tag","name":"td","attributes":{},"children":["This method is called with the validity of the CVC field. ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["isValid"]}," indicates whether the field is in a valid or invalid state."]}]},{"$$mdtype":"Tag","name":"tr","attributes":{},"children":[{"$$mdtype":"Tag","name":"td","attributes":{},"children":[{"$$mdtype":"Tag","name":"code","attributes":{},"children":["onValidationSuccess"]}]},{"$$mdtype":"Tag","name":"td","attributes":{},"children":["This method is called when all fields are in a valid state. You typically use this to enable the submit button."]}]}]}]}]},{"$$mdtype":"Tag","name":"Heading","attributes":{"level":2,"id":"call-our-hook-to-get-the-validation-initialization-function","__idx":6},"children":["Call our hook to get the validation initialization function"]},{"$$mdtype":"Tag","name":"p","attributes":{},"children":["You must now call our hook to get an instance of the function which will be used to initialize the validation of your UI."]},{"$$mdtype":"Tag","name":"p","attributes":{},"children":["To do this,"]},{"$$mdtype":"Tag","name":"ol","attributes":{},"children":[{"$$mdtype":"Tag","name":"li","attributes":{},"children":["create a ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["CardValidationConfig"]}," to specify the ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["id"]}," of the PAN, Expiry date and CVC ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["TextInput"]},"."]},{"$$mdtype":"Tag","name":"li","attributes":{},"children":["then call the ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["useCardValidation()"]}," hook passing on the ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["accessCheckout"]},", the ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["CardValidationConfig"]}," and your ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["CardValidationEventListener"]}," implementation."]}]},{"$$mdtype":"Tag","name":"p","attributes":{},"children":["In result you will get an ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["object"]}," with an ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["initialiseCardValidation"]}," property containing the function to use to effectively initialize the validation."]},{"$$mdtype":"Tag","name":"p","attributes":{},"children":["Here is an example detailing how to do this."]},{"$$mdtype":"Tag","name":"CodeBlock","attributes":{"file":"./code/validation/card/get-initialization-function.js","language":"json","header":{"controls":{"copy":{}}},"lang":"json","source":"import {\n  ...\n  CardValidationConfig,\n  useCardValidation,\n} from '@worldpay/access-worldpay-checkout-react-native-sdk';\n\nconst validationConfig = new CardValidationConfig({\n  panId: 'panInput',\n  expiryDateId: 'expiryDateInput',\n  cvcId: 'cvcInput',\n});\n\nconst { initialiseCardValidation } = useCardValidation(\n  accessCheckout,\n  validationConfig,\n  validationEventListener\n);\n"},"children":[]},{"$$mdtype":"Tag","name":"Heading","attributes":{"level":2,"id":"initialize-the-validation","__idx":7},"children":["Initialize the validation"]},{"$$mdtype":"Tag","name":"p","attributes":{},"children":["You can now initialize the validation using the ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["initialiseCardValidation()"]}," function."," ","Before doing so, you need to make sure that your UI components for PAN, Expiry Date and CVC are available in the DOM."]},{"$$mdtype":"Tag","name":"p","attributes":{},"children":["Validation initialization is an asynchronous process so make sure to handle the promise returned by the function."]},{"$$mdtype":"Tag","name":"CodeBlock","attributes":{"file":"./code/validation/card/initialize-validation.js","language":"json","header":{"controls":{"copy":{}}},"lang":"json","source":"import React from 'react';\nimport { ..., View } from 'react-native';\n  ...\n  <View\n    onLayout={() => {\n      initialiseCardValidation()\n        .then(() => {\n          // You may want to optionally perform some actions once validation has been successfully initialized.\n        })\n        .catch((error) => {\n          // do something in case of error\n        });\n    }}\n  >\n    ...\n  </View>\n  ...\n"},"children":[]},{"$$mdtype":"Tag","name":"Heading","attributes":{"level":4,"id":"card-validation-rules","__idx":8},"children":["Card validation rules"]},{"$$mdtype":"Tag","name":"p","attributes":{},"children":["The validation logic in the SDK, is based off a set of default rules for any card type. Specific brand rules are fetched from a ",{"$$mdtype":"Tag","name":"code","attributes":{},"children":["CardTypes"]}," JSON file, which holds the validation rules and card brand logos for each brand. 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'YOUR_CHECKOUT_ID',\n  });\n\n  const validationEventListener = {\n    onCardBrandChanged(brand) {\n      // TODO: handle the card brand change\n      // brand is an object properties name and images\n      // name contains the name of one of the brands supported and detected by the SDK\n      // images is an array of objects where each object has a type (image/png or image/svg+xml) and a url property\n      // brand will be undefined in the case where the PAN changes from a detected to an undetected card brand\n    },\n\n    onPanValidChanged(isValid) {\n      // TODO: handle the pan validation result\n    },\n\n    onExpiryDateValidChanged(isValid) {\n      // TODO: handle the expiry date validation result\n    },\n\n    onCvcValidChanged(isValid) {\n      // TODO: handle the cvc validation result\n    },\n\n    onValidationSuccess() {\n      // TODO: handle the form when the validation is complete i.e. all fields are valid\n    },\n  };\n\n  const validationConfig = new CardValidationConfig({\n    panId: 'panInput',\n    expiryDateId: 'expiryDateInput',\n    cvcId: 'cvcInput',\n  });\n\n  const { initialiseCardValidation } = useCardValidation(\n    accessCheckout,\n    validationConfig,\n    validationEventListener,\n  );\n\n  return (\n    <View\n      onLayout={() => {\n        initialiseCardValidation()\n          .then(() => {\n            // You may want to optionally perform some actions once validation has been successfully initialized.\n          })\n          .catch((error) => {\n            // do something in case of error\n          });\n      }}\n    >\n      <TextInput\n        nativeID=\"panInput\"\n        keyboardType=\"numeric\"\n        placeholder=\"Card Number\"\n      />\n      <TextInput\n        nativeID=\"expiryDateInput\"\n        keyboardType=\"numeric\"\n        placeholder=\"MM/YY\"\n      />\n      <TextInput\n        nativeID=\"cvcInput\"\n        keyboardType=\"numeric\"\n        placeholder=\"CVC\"\n      />\n    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of the brands supported and detected by the SDK\n      // images is an array of objects where each object has a type (image/png or image/svg+xml) and a url property\n      // brand will be undefined in the case where the PAN changes from a detected to an undetected card brand\n    },\n\n    onPanValidChanged(isValid: boolean): void {\n      // TODO: handle the pan validation result\n    },\n\n    onExpiryDateValidChanged(isValid: boolean): void {\n      // TODO: handle the expiry date validation result\n    },\n\n    onCvcValidChanged(isValid: boolean): void {\n      // TODO: handle the cvc validation result\n    },\n\n    onValidationSuccess(): void {\n      // TODO: handle the form when the validation is complete i.e. all fields are valid\n    },\n  };\n\n  const validationConfig = new CardValidationConfig({\n    panId: 'panInput',\n    expiryDateId: 'expiryDateInput',\n    cvcId: 'cvcInput',\n  });\n\n  const { initialiseCardValidation } = useCardValidation(\n    accessCheckout,\n    validationConfig,\n    validationEventListener\n  );\n\n  return (\n    <View\n      onLayout={() => {\n        initialiseCardValidation()\n          .then(() => {\n            // You may want to optionally perform some actions once validation has been successfully initialized.\n          })\n          .catch((error) => {\n            // do something in case of error\n          });\n      }}\n    >\n      <TextInput\n        nativeID=\"panInput\"\n        keyboardType=\"numeric\"\n        placeholder=\"Card Number\"\n      />\n      <TextInput\n        nativeID=\"expiryDateInput\"\n        keyboardType=\"numeric\"\n        placeholder=\"MM/YY\"\n      />\n      <TextInput\n        nativeID=\"cvcInput\"\n        keyboardType=\"numeric\"\n        placeholder=\"CVC\"\n      />\n    </View>\n  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