WHMCS + Google Analytics 4 Expert

We're using GA4 and WHMCS. We need an expert who could help us implement the Data layer on the purchase complete (complete.tpl) stage. At the moment limited data is showing as you can see below.

{
event: "gtm.js",
gtm: {uniqueEventId: 6, start: 1650401386783},
pageTitle: "Shopping Cart",
template: "lagom",
locale: "en_GB",
language: "english",
userType: "client",
userID: 31
}

On the previous stages of checkout process data is properly being transported as you see below.

{
event: "gtm.js",
gtm: {uniqueEventId: 7, start: 1650401317212},
pageTitle: "Shopping Cart",
template: "lagom",
locale: "en_GB",
language: "english",
userType: "visitor",
category: "ecommerce",
label: "checkout",
ecommerce: {
currencyCode: "PKR",
checkout: {
actionField: {
step: 2,
option: "checkout",
label: "checkout",
value: "1800.00"
},
products: [
{
id: "com",
name: "eatrchefer.com",
category: "com",
type: "com",
currencyCode: "PKR",
price: "1800.00",
quantity: 1,
coupon: ""
}
],
value: "1800.00"
}
}
}