Full historical data migration from OpenCart 3.0 to Shopify

I need to migrate all data from OpenCart v3.0 to Shopify.

Here’s an overview of the current data in OpenCart:
- Products: 113
- Orders: 14,702
- Customers: 2,618

We need to ensure that all data related to:
- customers
- orders
- products
- shipping
- coupons
- gift vouchers

Most importantly, the relationships between these entities must be preserved.
It’s also important to maintain the same product structure in Shopify (4 levels, not 3)

I don’t want to customize the Shopify theme — just perform a clean data migration while keeping the original structure intact.

The exact budget is 150 USD, non-negotiable, and the project must start immediately