Hi,
I am an expert Sage Developer and have previously developed similar integrations for Sage 50 (US version), Sage 50 (UK Version), Sage 100(Advanced), Sage 100 (French), Sage 200 and Sage 300.
For Sage 300 US version, I developed Integrations to ExactMax ERP (Purchase Orders, Purchase Receipts, Sales Orders, Sales Invoices) , Mar-Kov (Products, Sales Invoices, Sales Returns, Direct GL entries) and Shopify Store (sync Sales orders to Sage Sales Invoices). I already have complete development setup (Sage 300 test company installed, SDK Installed along with development tools) with me and can demonstrate above developed Integrations anytime you want.
I normally use another famously freelancing plate-form so would share my that profile with you as well where I am top rated plus freelancer with 100 % job Success ratio along with feedback from my clients.
Based on my expertise and experience, I believe that I am the most relevant person to develop this integration.
Looking forward to to work with you.
Thanks