International parcel delivery company seeks customs software (for exports)

We are an international parcel delivery service specializing in shipping parcels to China. Our customers (including businesses) often send parcels valued at over 1,000 euros, which means they are required to file an export declaration. We want to handle the export declaration on behalf of our customers and are therefore looking for suitable software.

The software should perform the following functions:

• Customs clearance with data transmission to ATLAS (Export)
• Generate export declarations for our customers (parcel senders)
• The software should ideally be integrable into our system (e.g., via an open programming interface or universal interface)
• When our customers print the shipping label on our website, an export declaration should also be generated and printed simultaneously

We anticipate 1–2 software workstations.