How to customize Packing Slip on ShipBlink?

{{ data.order_number }} - Order number on E-commerce channel (Shopify/BigCommerce etc)
{{ data.order_date_created }} - Order Create Date (ISO format)
{{ data.order_datetime_created }} - Order Created DateTime (ISO format)
{{ data.shipment_date_created }} - Shipment Label Created Datetime (ISO Format)
{{ data.shipment_datetime_created }} - Shipment Label Created DateTime (ISO format)
{{ data.order_shipping_cost }} - Order Total Shipping Cost
{{ data.order_handling_cost }} - Order Total Handling Cost
{{ data.order_tax_cost }} - Order Total Tax Paid
{{ data.order_total_cost }} Order Total Cost
{{ data.total_no_items }} - Total Number of Items in Order
{{ data.order_payment_method }} Order Payment Method
{{ data.order_currency_code }} - Order Currency Code,
{{ data.order_source }} - Source Name from E-commerce channels (etsy/amazon etc)
{{ data.order_notes }} - Notes/Staff Notes from E-commerce channels (etsy/amazon etc)
{{ data.order_items }} - [{
    {{ item.sku }} - SKU of Order Item
    {{ item.variant_name }} - Variant Name of Order Item
    {{ item.product_name }} - Product Name of Order Item
    {{ qty }} - Qty of Order Item
    {{ price }} - Price of Order Item
}],
{{ data.shipping_address }} - Shipping Address object
{{ data.origin_address }} - Origin Address object
{{ data.source }} - Source from which Order was created (shopify/bigcommerce/custom)
}