Changes to Return the data for a single Bill

added the new StatementTemplate enum value to the data/allOf[subschema #2]/bill_template/type response property for the response status 200

added the new singapore enum value to the data/allOf[subschema #2]/destination_account/compliance_region response property for the response status 200

added the new aggregate_fixed_fees enum value to the data/allOf[#/components/schemas/Bill_base]/kind response property for the response status 200

added the new aggregate_fixed_fees enum value to the data/allOf[subschema #2]/original_bill/kind response property for the response status 200

added the optional property data/allOf[#/components/schemas/Bill_base]/effective_bill_template_id to the response with the 200 status

added the optional property data/allOf[subschema #2]/bill_template to the response with the 200 status

added the optional property data/allOf[subschema #2]/original_bill/effective_bill_template_id to the response with the 200 status