Business identity
(Individual Industrial and Commercial Household)
Engineering Calculation Report
What the buyer provides
A metric engineering drawing in PDF, DXF or DWG format and the project parameters needed for calculation.
What the service produces
An English digital calculation report containing recognized geometry, members, loads, assumptions, calculation results and review warnings.
Delivery method
The finished file is delivered electronically through the buyer's signed-in account. No physical goods, shipping or freight are involved.
Important engineering limitation
The first international release uses the Chinese standards and material parameters identified in the report. It is not automatically adapted to local building codes outside China and is not a substitute for approval by a locally licensed engineer.
Price shown before payment
The system displays the recognized node count, unit price, currency and exact total before the buyer starts PayPal Checkout. Example: 3 nodes × USD 20.00 = USD 60.00. The order price is locked when the task is created.
How an international buyer purchases the service
Enter an email address and verify the one-time code.
Select a metric PDF, DXF or DWG file.
Confirm recognized members, loads and assumptions.
Review the USD total and approve PayPal Checkout.
After a completed payment, download the English digital report.
Order fulfilment and payment evidence
Automated checks
The server creates the order from the stored USD price, confirms the order and capture identifiers, verifies the amount and currency, and unlocks the result only after PayPal reports a completed capture.
Delivery record
The service retains the account, task, payment reference, result status and download status needed to support customer service, reconciliation and dispute review.
Transaction terms
- The buyer must own or be authorized to use every uploaded drawing and must provide accurate project parameters.
- The service is a digital calculation aid. The buyer remains responsible for engineering review, local-code compliance, construction decisions and professional approval.
- The exact node count, USD unit price and total are displayed before payment approval.
- Access to the deliverable is personal to the purchasing account and may not be used for unlawful purposes.
- Uploaded drawings and results may be removed after the stated retention period. Buyers should download and safely retain their files.
- PayPal's applicable user agreement, buyer protection and seller protection rules also apply to the payment.
Refund Policy
- The buyer may cancel before approving payment in PayPal.
- If payment is completed but the service fails to produce an accessible deliverable because of a verified system fault, the buyer may request correction or a refund within 7 calendar days.
- After a report has been successfully generated and made available for download, refunds are not normally provided for a change of mind because the customized digital service has been performed.
- This policy does not limit any non-waivable rights or protections available under applicable law or PayPal rules.
Privacy Notice
- The service processes the buyer's email address, verification records, IP/security logs, uploaded drawings, calculation inputs, task status and delivery records.
- PayPal processes payment-account and funding information under its own privacy terms. This website does not request or store the buyer's PayPal password or full card number.
- Information is used to authenticate users, provide the requested report, prevent abuse, reconcile payments, support customers and meet legal obligations.
- Access to uploaded files and results is restricted to the signed-in owner and authorized service administrators.
Contact and dispute handling
Merchant: Beijing Weicheng Technology Business Department (Individual Industrial and Commercial Household)
Business telephone: +86 138 1141 5892
Website: https://zhijia-kz.cn/en
For an order inquiry, the buyer should provide the account email, PayPal transaction reference and task identifier. Sensitive credentials, passwords and full card details must never be sent to customer support.