Order Independent callback logic

gistfile1.txt

// add Login and Pay callbacks

 window.onAmazonPaymentsReady = () => {
   this.createButton(sellerId, scope, type, color, size, mountLocation);
 } 

// if the OffAmazonPayments namespace is already available, call the callback manually - otherwise wait for Amazon to call it 

if (typeof window.OffAmazonPayments !== 'undefined') { 
  window.onAmazonPaymentsReady(); 
}

createButton(sellerId, scope, type, color, size, mountLocation) {
        
        window.OffAmazonPayments.Button(mountLocation, sellerId, {
            type,
            color,
            size,
            authorization: () => {
                const loginOptions = { scope };

                window.amazon.Login.authorize(loginOptions, this.onAuthorize);
            },
            onError: this.onError,
        });
    }
}