Guide
How to Sign a Purchase Order Online
Purchase orders formally authorise purchases at agreed terms and pricing. Sign them electronically to speed up procurement.
Steps
- 1
Create purchase order with line items, quantities, and pricing
- 2
Send to supplier for acknowledgement via API or MCP
- 3
Supplier signs to confirm the order terms
- 4
Both parties receive the signed PO with audit trail
- 5
Clear, tamper-proof record of ordered items and agreed prices
Try it with curl
curl -X POST https://signb.ee/api/send \
-H "Content-Type: application/json" \
-d '{
"content": "# Your Document\n\nContent here...",
"senderName": "Your Name",
"senderEmail": "you@email.com",
"recipientName": "Recipient",
"recipientEmail": "recipient@email.com"
}'Legal validity
Electronic signatures are legally binding under the ESIGN Act (US), eIDAS Regulation (EU), and Electronic Communications Act (UK). Every Signbee document includes a SHA-256 tamper-proof certificate.
More details
Signed purchase orders create a binding commitment between buyer and supplier. Without a signature, purchase orders can be disputed — quantities changed, prices contested, delivery dates renegotiated.
Electronic signing streamlines procurement. Instead of printing POs, getting physical signatures from procurement managers, and faxing to suppliers, the entire process happens digitally in minutes.
For procurement teams processing high volumes, the API enables automated PO generation and signing. When a purchase requisition is approved in your ERP or procurement system, automatically generate the PO and send it for supplier signature — no manual steps.
The SHA-256 certificate on every signed PO proves the exact terms both parties agreed to, protecting against disputes over quantities, pricing, or delivery dates.
Frequently asked questions
Is a signed purchase order legally binding?
Yes. A signed purchase order constitutes a binding agreement between buyer and supplier. Electronic signatures make POs equally binding under ESIGN and eIDAS.
Can I automate purchase order signing?
Yes. Use the Signbee API to automatically generate and send POs for signature when purchase requisitions are approved in your ERP system.
Related resources
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