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document.querySelector(`script[src=\"${src}\"]`);\n}\n\nfunction loadCheckoutScript(src) {\n return new Promise((resolve, reject) => {\n if (scriptAlreadyLoaded(src)) {\n resolve();\n return;\n }\n\n let checkoutScript = document.createElement(\"script\");\n checkoutScript.src = src;\n checkoutScript.onload = resolve;\n checkoutScript.onerror = reject;\n document.head.appendChild(checkoutScript);\n });\n}\n\nfunction addWorldpayCheckoutToPage() {\n return new Promise((resolve, reject) => {\n (function () {\n window.Worldpay.checkout.init(\n {\n id: \"your-checkout-id\",\n form: \"#container\",\n fields: {\n pan: {\n selector: \"#card-pan\",\n },\n expiry: {\n selector: \"#card-expiry\",\n },\n cvv: {\n selector: \"#card-cvv\",\n },\n },\n styles: {\n \"input.is-valid\": {\n \"color\": \"green\",\n },\n \"input.is-invalid\": {\n \"color\": \"red\",\n },\n \"input.is-onfocus\": {\n \"color\": \"black\",\n },\n },\n enablePanFormatting: true,\n allowNonLuhnCompliantCards: true,\n },\n function (error, checkout) {\n if (error) {\n reject(error);\n } else {\n resolve(checkout);\n }\n },\n );\n })();\n });\n}\n\nfunction CheckoutIntegrationSample() {\n const checkoutScriptUrl = \"https://try.access.worldpay.com/access-checkout/v2/checkout.js\";\n let checkout;\n\n function generateSession () {\n checkout.generateSessionState(\n function (error, session) {\n if (error) {\n console.warn(`Failed to generate session: ${error}`);\n return;\n }\n\n const infoDiv = document.querySelector(\".info\");\n infoDiv.innerHTML += `