public class MyMod {

    public MyMod() {
        // Begin building a custom portal
        CustomPortalBuilder.beginPortal()
            // Set the frame block to Diamond Blocks
            // You can use a registered Block or a Resource Location here
            .frameBlock(Blocks.DIAMOND_BLOCK)

            // Set the item used to ignite the portal
            // Options include:
            // - Using an Ender Eye (as shown)
            // - Using water with lightWithWater()
            // - Using a custom fluid with lightWithFluid(MyFluids.CUSTOMFLUID)
            .lightWithItem(Items.ENDER_EYE)

            // (Optional) Set a forced size for the portal
            // Parameters are width and height
            .forcedSize(4, 5)

            // (Optional) Set a custom block for the portal itself
            // Replace MyBlocks.CUSTOMPORTALBLOCK with your custom portal block
            .customPortalBlock(MyBlocks.CUSTOMPORTALBLOCK)

            // (Optional) Configure the portal's return dimension
            // `onlyIgnitInReturnDim` specifies if the portal can only be ignited in the return dimension
            // 1.21+ requires ResourceLocation.parse or similar methods instead of new ResourceLocation
            .returnDim(new ResourceLocation("overworld"), onlyIgnitInReturnDim)

            // (Optional) Restrict portal ignition to the Overworld
            // Use this if you want the portal to be ignitable only in the Overworld
            .onlyLightInOverworld()

            // (Optional) Use the flat portal style, similar to the End Portal
            // Apply this style to make the portal's appearance flat
            .flatPortal()

            // Set the dimension to travel to when the portal is used
            // In this case, it sets the destination dimension to The End
            // 1.21+ requires ResourceLocation.parse or similar methods instead of new ResourceLocation
            .destDimID(new ResourceLocation("the_end"))

            // (Optional) Set the RGB color for the portal's tint
            // Customize the portal's appearance with a specific color
            .tintColor(45, 65, 101)

            // (Optional) Custom frame tester
            // 1.21+ requires ResourceLocation.parse or similar methods instead of new ResourceLocation
            .customFrameTester(new ResourceLocation("mymod", "custom_frame_tester"))

            // (Optional) Custom ignition source by ResourceLocation
            // 1.21+ requires ResourceLocation.parse or similar methods instead of new ResourceLocation
            .customIgnitionSource(new ResourceLocation("mymod", "custom_ignition_source"))

            // (Optional) Add event handling for pre/post teleportation
            .registerBeforeTPEvent(entity -> {
                // Example logic: cancel for non-player entities
                return entity instanceof Player ? SHOULDTP.TP : SHOULDTP.CANCEL_TP;
            })
            .registerPostTPEvent(entity -> {
                // Example logic for after teleportation
                System.out.println("Entity teleported: " + entity.getName().getString());
            })

            // (Optional) Add custom sounds
            .registerInPortalAmbienceSound(player -> new CPASoundEventData(/* Your sound data */))
            .registerPostTPPortalAmbience(player -> new CPASoundEventData(/* Your sound data */))

            // Register the custom portal with all the specified configurations
            .registerPortal();
    }
}