> For the complete documentation index, see [llms.txt](https://sspwallet.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sspwallet.gitbook.io/docs/ssp-key-development/project-folders/src/lib.md).

# lib

The following files are inside the lib folder

<div align="left"><figure><img src="https://2029399859-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FOLYjN2kelo3HWVPLgZVU%2Fuploads%2FGcIgXttr0NkypqUK9Alr%2Fimage.png?alt=media&amp;token=9d39177d-8410-4754-9dcd-cc1aea8f7da9" alt="" width="162"><figcaption></figcaption></figure></div>

<table><thead><tr><th width="231">File Name</th><th>Description</th></tr></thead><tbody><tr><td>constructTx.ts</td><td>A file that contains functionalities of constructing transaction</td></tr><tr><td>fcmHelper.ts</td><td>A file that contains functionalities of Firebase Cloud Messaging</td></tr><tr><td>tokens.ts</td><td>A file that contains functionalities of token metadata</td></tr><tr><td>transactions.ts</td><td>A file that contains functionalities of transaction information</td></tr><tr><td>wallet.ts</td><td>A file that contains functionalities of wallet security</td></tr></tbody></table>