Fix Laravel–Amicron Order Import

My Laravel-based shop is already pushing orders into Amicron, yet every import ends up tying the order to the wrong customer. The mismatch is isolated to customer information—specifically the customer ID—while product lines and amounts look fine.

I need someone who knows both Laravel (PHP 8) and Amicron’s import interface well enough to:
• trace the current mapping logic,
• correct the field assignment for customer IDs, and
• validate the fix by running test orders on our staging copy of Amicron.

The work is finished when a new order placed in Laravel lands in Amicron with the exact customer ID we see in the shop database, no manual corrections required. Access to the Git repo and a staging Amicron DB will be provided as soon as we agree on the approach.