> For the complete documentation index, see [llms.txt](https://docs.galaxypay.vn/upc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.galaxypay.vn/upc/payment-gateway/api-specification/definitions.md).

# Definitions

## Field Attributes

<table><thead><tr><th width="180">Definition</th><th>Remark</th></tr></thead><tbody><tr><td>Mandatory (M)</td><td>Required when call API</td></tr><tr><td>Optional (O)</td><td>DOT NOT Required when call API</td></tr><tr><td>Condition (C)</td><td>Base on Condition of another field when call API, that field can be Required or Optional</td></tr></tbody></table>

## Field Types

<table><thead><tr><th width="197">Definition</th><th>Remark</th></tr></thead><tbody><tr><td>Alpha</td><td>String data, including capital letters (A-Z), usually (a-z)</td></tr><tr><td>Numeric</td><td>Numeric data, consisting only of numeric characters (0-9)</td></tr><tr><td>Alphanumeric</td><td>Numeric data, including uppercase, lowercase, and numeric characters</td></tr><tr><td>JSON Object</td><td>JSON object data</td></tr><tr><td>JSON Array</td><td>JSON array data</td></tr></tbody></table>