Custom 'Paid Purchase' Event Setup on Shopify

I need an expert in Shopify and GTM to create a custom conversion event named 'Paid Purchase'.

This event will trigger when a customer successfully completes a payment through SSLCommerz and arrives on the payment confirmation page. The parameters must be transmitted via both the Pixel and the Conversion API.

Key Responsibilities:
- Create a custom conversion event named 'Paid Purchase'.
- Ensure the event triggers upon customer payment confirmation.
- Transmit parameters through both Pixel and Conversion API.

Data Points to be Tracked:
- Transaction ID
- Purchase Amount
- Customer ID
- First Name
- Last Name
- Address
- Phone Number
- City

Please provide your quote and estimated time for completion. Thank you.

Here is my website
https://ibnmain.com/