gsg.tech valid

PaymentExpress Developer Portal Documentation

Documentation for PaymentExpress Developer Portal

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-22T16:01:27.705Z. Cached copy · Source on gsg.tech

# PaymentExpress Developer Portal Documentation

> Documentation for PaymentExpress Developer Portal

## Guides: Integration Basics
- [Integration Overview](https://docs.gsg.tech/docs/getting-started.md)
- [Which Integration Is Right For You?](https://docs.gsg.tech/docs/why-choose-your-integration-type.md)
- [Getting Connected and Authenticated](https://docs.gsg.tech/docs/getting-connected-and-authenticated.md): A Guide for helping you authenticate and check your connection to the PaymentExpress APIs.

## Guides: Online Payments
- [Online Payment Solutions](https://docs.gsg.tech/docs/taking-online-payments.md): An overview of Online Payment Solutions with PaymentExpress
- [Taking Online Payments: Hosted Checkout](https://docs.gsg.tech/docs/creating-a-cart-handoff.md)
- [Taking Online Payments: Embedded Checkout](https://docs.gsg.tech/docs/embedded-checkout.md)
  - [Try Out Embedded Checkout!](https://docs.gsg.tech/docs/try-out-embedded-checkout.md)
  - [Delayed Capture](https://docs.gsg.tech/docs/delayed-capture.md)
  - [Content Security Policy Guide](https://docs.gsg.tech/docs/content-security-policy-guide.md)
  - [Digital Wallet Domain Verification](https://docs.gsg.tech/docs/digital-wallet-domain-verification.md)
  - [Saved Payment Methods](https://docs.gsg.tech/docs/saved-payment-methods.md)

## Guides: In Person Payments
- [Creating an In Person Cart Handoff](https://docs.gsg.tech/docs/creating-an-otc-cart-handoff.md)
- [Hosted In Person Checkout](https://docs.gsg.tech/docs/online-checkout-otc.md)
- [Embedded In Person Checkout](https://docs.gsg.tech/docs/embedded-otc-checkout.md)

## Guides: Voice Payments
- [Taking Payments by Voice](https://docs.gsg.tech/docs/taking-payments-by-voice.md): An overview of the workflow to take payments by voice (IVR) using PaymentExpress.

## Guides: Reconciliation
- [Payment Activity File](https://docs.gsg.tech/docs/payment-activity-file.md)

## Guides: Post-Payment Operations
- [Receipt Generation](https://docs.gsg.tech/docs/receipt-generation.md)

## Guides: Testing And support
- [Test Payment Information](https://docs.gsg.tech/docs/test-tenders.md)

## API Reference: PaymentExpress Client API
- Authentication
  - [Fetch Auth Token](https://docs.gsg.tech/reference/requestjwt.md): OAuth2 Client Credentials request for fetching a JavaScript Web Token (JWT), which can then be used for authorization of further requests against the API.  After retrieving a JWT, it is a best…
- Online Checkout
  - [Create Online Checkout Redirect](https://docs.gsg.tech/reference/createcart.md): The Online Cart Creation request will be used to build the subsequent cart in the redirect / checkout page.  The cart response will indicate the URL the user should be directed to in order to…
  - [Check Online Cart Status](https://docs.gsg.tech/reference/getcartinfo.md): Allows for a client to fetch the status of a given online cart, including if a payment has been made for this cart. NOTE: Carts may be expired from the system after 30
…

Related sites

Find similar publishers by meaning →

Other listed sites in Developer tools. See the whole category →

Machine-readable: GET /v1/resolve?q=gsg.tech · GET /v1/domain/gsg.tech · this page as Accept: application/json or text/markdown · MCP lookup_domain

Automatically discovered from public files. Inclusion does not imply endorsement or publisher participation.

Claim my listing on Agent Web Map for gsg.tech:
1. POST https://agentwebmap.com/v1/sites/gsg.tech/claims and keep claim_id and claim_secret private.
2. Publish the proof: add the line "AgentWebMap ownership: <token>" (token from step 1) to https://gsg.tech/llms.txt, or use the DNS, meta-tag or well-known method the response describes.
3. POST https://agentwebmap.com/v1/sites/gsg.tech/verify with {"claim_id": "...", "claim_secret": "..."}.
4. Save the api_key from the answer; it manages the listing (PATCH https://agentwebmap.com/v1/sites/gsg.tech).
MCP equivalent: tools begin_ownership_claim, then verify_domain, at https://agentwebmap.com/mcp. Docs: https://agentwebmap.com/docs#verify

Corrections or removal requests: contact the directory.