add new column to put nullability params info

source/includes/static_va.md.erb

@@ -1949,19 +1949,19 @@ Once user successfully do the payment, our system will make a callback via HTTP
 
 ### Callback Parameters
 
-Parameter | Type | Description
---------- | ---- | -----------
-va_number | String(20) | Generated VA number
-amount | BigDecimal | Amount of VA transaction
-partner_user_id | String(255) | Unique ID provided by partner for specific user
-success | boolean | The status of the payment and it is always set to SUCCESS
-tx_date | Timestamp | Incoming payment transaction date, format `dd/MM/yyyy'T'HH:mm:ss.SSSZZZZ`
-username_display | String(255) | Customizable VA display name that will be seen by user. If partner did not provide the value on creation VA, then it will be using partner’s username
-trx_expiration_date | Long | Transaction expiration date, format `dd/MM/yyyy'T'HH:mm:ss.SSSZZZZ`
-partner_trx_id | String(255) | Unique Transaction ID provided by partner on creation or update VA. This parameter will be empty if partner leave this parameter empty when creating or updating the VA
-trx_id | String (255) | Unique ID of incoming payment
-settlement_time | Timestamp | The timestamp (in UTC+7) indicating when the fund will be settled to partner’s account statement, format `dd/MM/yyyy'T'HH:mm:ss.SSSZZZZ`
-settlement_status | String(255) | The status of the settlement
+Parameter | Type | Nullable | Description
+--------- | ---- | -------- | -----------
+va_number | String(20) | FALSE | Generated VA number
+amount | BigDecimal | FALSE | Amount of VA transaction
+partner_user_id | String(255) | FALSE | Unique ID provided by partner for specific user
+success | boolean | FALSE | The status of the payment and it is always set to SUCCESS
+tx_date | Timestamp | FALSE | Incoming payment transaction date, format `dd/MM/yyyy'T'HH:mm:ss.SSSZZZZ`
+username_display | String(255) | FALSE | Customizable VA display name that will be seen by user. If partner did not provide the value on creation VA, then it will be using partner’s username
+trx_expiration_date | Long | FALSE | Transaction expiration date, format `dd/MM/yyyy'T'HH:mm:ss.SSSZZZZ`
+partner_trx_id | String(255) | TRUE | Unique Transaction ID provided by partner on creation or update VA. This parameter will be empty if partner leave this parameter empty when creating or updating the VA
+trx_id | String (255) | FALSE | Unique ID of incoming payment
+settlement_time | Timestamp | FALSE | The timestamp (in UTC+7) indicating when the fund will be settled to partner’s account statement, format `dd/MM/yyyy'T'HH:mm:ss.SSSZZZZ`
+settlement_status | String(255) | FALSE | The status of the settlement
 
 <aside class="warning">
 Note: For payments and inquiries involving a BSI VA using BSI Mobile or Banking Syariah Indonesia Net, please only input the last 12 digits of the va_number (remove 6059 from the va_number with format "6059xxxxxxxxxxxx"). This does not apply to payments and inquiries involving a BSI VA using other methods