pos-printer is a Go application designed to fetch order details from an API and print a formatted receipt on a thermal printer. It uses environment variables for configuration and supports token-based authentication.

• Go 1.16 or later
• A .env file with the necessary environment variables

Create a .env file in the root directory of the project with the following variables:

API_USERNAME=your_api_username
API_KEY=your_api_key
TOKEN_URL=https://example.com/get-token
ORDER_URL=https://example.com/orders/%s
HEADER_KEY=your_header_key
HEADER_VALUE=your_header_value
STORE_NAME=Your Store Name
STORE_LINK=https://yourstore.com
STORE_ADDRESS=Your Store Address

Run the following command to install the required dependencies:

go mod tidy

1. Build the application:

go build -o pos-printer

2. Run the application:

./pos-printer

3. Enter the order ID when prompted to fetch and print the receipt.

• Footer Template: Customize the footer of the receipt by editing the footer_template.txt file.
• Receipt Formatting: Modify the printReceipt function in main.go to change the receipt format.

This project is licensed under the MIT License.