What have been done:

1. Updated email html template from Oscar.
2. Fixed the exception where Clock used in Special class cannot be saved into MongoDB.

Problems encountered:

1. Exception triggered while saving Special class to DB: “Can’t find a codec for class java.time.Clock$SystemClock.”.

Solution:

1. Use the annotation @Transient on the Clock property to prevent Spring Framework mapping
2. Use the annotation @Builder on an empty contructor to prevent Lombok automatic mapping. Refer to link below:
   https://stackoverflow.com/questions/30717640/how-to-exclude-property-from-lombok-builder