promptpay-qr 0.1.0

Generate PromptPay QR code payloads and images (EMV QRCPS compliant)

promptpay-qr

A minimal Python library for generating PromptPay QR code payloads and images, compliant with the EMV QRCPS Merchant Presented Mode specification.

Features

• Generate PromptPay QR payload strings from a phone number, national/tax ID, or e-Wallet ID
• Optionally embed a pre-filled transfer amount
• Render the payload as a PNG image (requires qrcode[pil])
• Zero required dependencies for payload-only generation

Installation

pip install promptpay-qr

To also generate QR images:

pip install "promptpay-qr[image]"
# or manually:
pip install qrcode[pil]

Quick start

from promptpay_qr import generate_payload, generate_qr_image

# Payload only
payload = generate_payload('0910783112')
payload = generate_payload('0910783112', amount=4.22)

# Save QR image to file
generate_qr_image('0910783112', filename='qr.png')
generate_qr_image('0910783112', amount=100.0, filename='qr_100.png')

# Get a PIL.Image object (e.g. to display in a notebook)
img = generate_qr_image('0910783112', amount=50.0)
img.show()

API

generate_payload(target, amount=None) -> str

Generates the raw PromptPay QR payload string.

Parameter	Type	Description
target	str	PromptPay ID — phone number (10 digits), national/tax ID (13 digits), or e-Wallet ID (15+ digits). Dashes and spaces are stripped automatically.
amount	float | None	Transfer amount in THB. When provided, banking apps pre-fill the amount field.

Returns a str that can be encoded as any standard QR code.

---

generate_qr_image(target, amount=None, filename=None, size=300)

Generates a PromptPay QR code image.

Parameter	Type	Description
target	str	PromptPay ID (same rules as above).
amount	float | None	Optional amount in THB.
filename	str | None	Path to save the image (PNG recommended). If None, returns a PIL.Image instead.
size	int	Output image size in pixels (default 300).

Returns PIL.Image when filename is None, otherwise saves the file and returns None.

Requires qrcode[pil] — raises ImportError with installation instructions if missing.

Supported PromptPay ID types

Type	Digits	Example
Phone number	10	0910783112
National / tax ID	13	1234567890123
e-Wallet ID	15+	004999000288505

Leading 0 in phone numbers is automatically converted to the +66 country prefix per the PromptPay spec.

Specification

Built on the EMV QRCPS Merchant Presented Mode specification and the Bank of Thailand PromptPay standard.

License

MIT