Constructing a Rule
A rule has two main parts: conditions and a fee. When Calculate Service Fees is called, it assesses each rule in relation to the specified order. When a rule is assessed, if the conditions are met, the fee is included in the API's response.
Conditions
Conditions can be either a single condition or a condition tree.
A single condition evaluates a specific field in the order. For example, it could check if the value of the field is greater than a certain number.
A condition tree contains two conditions and an operator. The conditions can each be either a single condition or a condition tree. There are two operator values:
"AND"
: Both conditions must be met for the condition tree to be considered met."OR"
: At least one of the conditions must be met for the condition tree to be considered met.
Condition tree example
Conditions
For the service fee to be applied, we would need to satisfy these conditions:
- The price subtotal is greater than
50
AND - Either:
- Delivery type is
"DELIVERY"
OR - Order is made in the mobile app
- Delivery type is
Example: Conditions are met
We have the following values:
- Subtotal is
70
- Delivery type is
"DELIVERY"
- Order is
"WEBSITE"
In this case, the conditions are met, because the subtotal is greater than 50
and the delivery type is "DELIVERY"
. It doesn't matter that the platform isn't "MOBILE_APP"
because we only need that OR delivery type to be "DELIVERY"
.
Example: Conditions are not met
We have the following values:
- Subtotal is
30
- Delivery type is
"DELIVERY"
- Order is
"MOBILE_APP"
In this case, the conditions are not met, because even though the delivery type is "DELIVERY"
and the platform is "MOBILE_APP"
, the subtotal is not greater than 50
.
Fee
A fee is either a fixed amount or a percentage of the order's subtotal. It can also include tax.
If the conditions are met, the fee is calculated and applied when Calculate Service Fees is called.