Gravity Payments

Integrated Payment Solutions

For businesses looking to easily integrate robust payment solutions into their software applications



Save time, reduce errors, and enjoy centralized in-software reporting.


Sell goods, collect deposits, and take recurring payments through our unified online payment system.

Payment on-the-go via a mobile phone


Collect payment anywhere using portable and virtual terminals that run on 4G. 

Integration Methods

Intuitive payments integration from our fast and scalable cloud-based solution – emergepay.


Our simple form is a reactive, mobile-friendly UI solution with fixed size and placement for easy implementation.

emergepay modal

Embedded Form (URL Page)

Our instant solution provides a pre-built form within an iFrame

emergepay embedded form

Custom Form

Our custom form (Hosted Fields) is a fully customizable solution that gives you design and data flexibility.

emergepay hosted fields


Our eCommerce solution for developers seeking complete control over the flow of a transaction while remaining out of scope for PCI.

emergepay checkout

Digital Wallets

Our solutions are compatible with Google Pay and Apple Pay digital wallet services.

emergepay digital wallets

emergepay Direct Post icon

Direct Payments (ACH)

Recurring payments through a secure web environment using clients’ bank accounts and routing numbers.

emergepay logo

Our cloud-based API is simple to use and available in common languages like JavaScript, TypeScript, PHP and C#.

emergepay makes it simple to add a payment modal, payment window, or custom fields embedded into your site or app.

//transactionType: "CreditSale"
//install the npm modules: 'npm install express cors emergepay-sdk'
var express = require("express");
var cors = require("cors");
var sdk = require("emergepay-sdk");

//Your private and secure creditials
var oid = "your_oid"; //Organization ID
var authToken = "your_authToken"; //Secretly generated specific to you org
var environmentUrl = "environment_url"; //Sandbox or Production environment
var emergepay = new sdk.emergepaySdk({ oid: oid, authToken: authToken, environmentUrl: environmentUrl });

var app = express();
app.use(express.urlencoded({ extended: true }));
app.use(cors());"/start-transaction", function (req, res) {
    var amount = "0.01";
    var config = {
        transactionType: sdk.TransactionType.CreditSale,
        method: "modal",
        fields: [
                id: "base_amount",
                value: amount
                id: "external_tran_id",
                value: emergepay.getExternalTransactionId()
    .then(function (transactionToken) {
            transactionToken: transactionToken
    .catch(function (err) {

console.log("listening on port 5555");
//transactionType: "CreditSale"
//install the npm modules: 'npm install express cors emergepay-sdk
import * as express from "express";
import * as cors from "cors";
import {emergepaySdk, TransactionType} from "emergepay-sdk";

//Your private and secure creditials
const oid: string = "your_oid";
const authToken: string = "your_authToken";
const environmentUrl: string = "environment_url";
const emergepay: emergepaySdk = new emergepaySdk({oid, authToken, environmentUrl});

const app: any = express();


//The client side can hit this endpoint by issuing a POST request to
//base_amount and external_tran_id are required in the fields array."/start-transaction", (req, res) => {
    const amount = "0.01";
    const config: any = {
        transactionType: TransactionType.CreditSale,
        method: "hostedFields",
        fields: [
                id : "base_amount",
                value : amount
                id : "external_tran_id",
                value : emergepay.getExternalTransactionId()

        .then(transactionToken => {
                transactionToken: transactionToken
        .catch(err => {

console.log("listening on port 5555");
//transactionType: "CreditSale"
public async Task<object> StartTransactionAsync(StartTransactionModel config)
  var response = new object();

//Use your private and secure creditials
  const string OID = "your_oid";
  const string AUTH_TOKEN = "your_authToken";
  const string ENDPOINT_URL = "environment_url";

  string url = $"{ENDPOINT_URL}/orgs/{OID}/transactions/start";

  var contents = new
    transactionData = new
      transactionType = "CreditSale",
      method = "hostedFields",
      fields = new[]
        new { id = "base_amount",           value = config.Amount },
        new { id = "external_tran_id",      value = Guid.NewGuid().ToString() },
        new { id = "billing_name",          value = config.BillingName },
        new { id = "billing_address",       value = config.BillingAddress },
        new { id = "billing_postal_code",   value = config.BillingPostalCode },
        new { id = "transaction_reference", value = config.TransactionReference },
        new { id = "cashier_id",            value = config.CashierId }

    using (var client = new HttpClient())
      var transactionJson = JsonConvert.SerializeObject(contents);

      HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, url);
      request.Headers.Add("Authorization", $"Bearer {AUTH_TOKEN}");
      request.Content = new StringContent(transactionJson, Encoding.UTF8, "application/json");

      var httpResponse = await client.SendAsync(request);
      var data = await httpResponse.Content.ReadAsStringAsync();
      response = JsonConvert.DeserializeObject(data);
  catch (Exception exc)
    throw exc;

  return response;

//transactionType: "CreditSale"
    'transactionType' => 'CreditSale',
    'method' => 'hostedFields',
    'fields' => array(
      array('id' => 'base_amount', 'value' => '0.01'),
      array('id' => 'external_tran_id', 'value' => GUID())

//Configure the request
$request = curl_init($url);
curl_setopt($request, CURLOPT_HEADER, false);
curl_setopt($request, CURLOPT_RETURNTRANSFER, true);
curl_setopt($request, CURLOPT_HTTPHEADER, array('Content-Type: application/json', 'Authorization: Bearer ' . $authToken));
curl_setopt($request, CURLOPT_POST, true);
curl_setopt($request, CURLOPT_POSTFIELDS, json_encode($body));

//Issue the request and get the response
$response = curl_exec($request);

echo $response;

function GUID()
    if (function_exists('com_create_guid') === true)
        return trim(com_create_guid(), '{}');

    return sprintf('%04X%04X-%04X-%04X-%04X-%04X%04X%04X', mt_rand(0, 65535), mt_rand(0, 65535), mt_rand(0, 65535), mt_rand(16384, 20479), mt_rand(32768, 49151), mt_rand(0, 65535), mt_rand(0, 65535), mt_rand(0, 65535));

Gravity Dashboard

A finger on the pulse of your business.

Gravity Dashboard

Comprehensive Homepage

Get a high-level overview of your transaction history with a comprehensive dashboard view.

Gravity Dashboard screenshot showing transactions table

Transaction Reporting

When viewing all of your transactions, a straightforward filtering system helps you view the information you’re looking for.
Gravity Dashboard screenshot showing the virtual terminal

Virtual Terminal Console

Continue accepting card payments if your physical card reader ever goes down by turning your browser into an easy-to-use terminal.

Additional Features

Text to Pay

Text to Pay

SMS payment links for customer invoices.

Tokenized Transactions

Secure and unique strings of numbers that replace sensitive card data.

ACH Payments

Secure bank transfers without checks, credit cards, wire, or cash.

PCI Compliance & Data Security

Peace of mind comes with a high standard in data security.

Wireless/4G Devices

The latest and most functional devices on the market.

Secure Card Storage

Safe card storage for automated billing.

Local Payment Solutions

A cloud-alternative desktop app to communicate transaction information.

Want to work with Gravity or need development help?


Tailored payments solutions, friendly financing, and 24/7 America-based support to help you grow your business with confidence.



Let’s work together to broaden your reach, diversify your revenue, and better support main street small businesses.