Create Checkout

curl -X POST 'https://api-sandbox.paywithsoap.com/api/v1/checkouts' \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer YOUR_API_KEY' \
--data '{
    "customer_id": "cus_vi57KegYgcRqcGHqip8q6UZiqtrwMT870",
    "type": "deposit"
}'

require 'net/http'
require 'uri'
require 'json'

uri = URI.parse('https://api-sandbox.paywithsoap.com/api/v1/checkouts')
request = Net::HTTP::Post.new(uri)
request.content_type = 'application/json'
request['Authorization'] = 'Bearer YOUR_API_KEY'
request.body = {
  customer_id: 'cus_vi57KegYgcRqcGHqip8q6UZiqtrwMT870',
  type: 'deposit'
}.to_json

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(request)
end

puts response.body

const fetch = require('node-fetch');

const options = {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer YOUR_API_KEY'
  },
  body: JSON.stringify({
    customer_id: 'cus_vi57KegYgcRqcGHqip8q6UZiqtrwMT870',
    type: 'deposit'
  })
};

fetch('https://api-sandbox.paywithsoap.com/api/v1/checkouts', options)
  .then(response => response.json())
  .then(data => console.log(data))
  .catch(error => console.error('Error:', error));

import requests
import json

url = "https://api-sandbox.paywithsoap.com/api/v1/checkouts"
headers = {
    "Content-Type": "application/json",
    "Authorization": "Bearer YOUR_API_KEY"
}
data = {
    "customer_id": "cus_vi57KegYgcRqcGHqip8q6UZiqtrwMT870",
    "type": "deposit"
}

response = requests.post(url, headers=headers, json=data)
print(response.json())

{
    "url": "https://wallet-sandbox.paywithsoap.com?clientSecret=HMC3VTosbzJd7cLsoP3geC5QmSz8jqF6",
    "id": "chk_HBq6ExeoRDMPFCCabR8n1h7S1towds7K",
    "client_secret": "HMC3VTosbzJd7cLsoP3geC5QmSz8jqF6",
    "line_items": [],
    "line_items_total_amount_cents": null,
    "balance_amount_cents": null,
    "type": "deposit",
    "fixed_amount_cents": null,
    "experience": null
}

POST

api

checkouts

curl -X POST 'https://api-sandbox.paywithsoap.com/api/v1/checkouts' \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer YOUR_API_KEY' \
--data '{
    "customer_id": "cus_vi57KegYgcRqcGHqip8q6UZiqtrwMT870",
    "type": "deposit"
}'

require 'net/http'
require 'uri'
require 'json'

uri = URI.parse('https://api-sandbox.paywithsoap.com/api/v1/checkouts')
request = Net::HTTP::Post.new(uri)
request.content_type = 'application/json'
request['Authorization'] = 'Bearer YOUR_API_KEY'
request.body = {
  customer_id: 'cus_vi57KegYgcRqcGHqip8q6UZiqtrwMT870',
  type: 'deposit'
}.to_json

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(request)
end

puts response.body

const fetch = require('node-fetch');

const options = {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer YOUR_API_KEY'
  },
  body: JSON.stringify({
    customer_id: 'cus_vi57KegYgcRqcGHqip8q6UZiqtrwMT870',
    type: 'deposit'
  })
};

fetch('https://api-sandbox.paywithsoap.com/api/v1/checkouts', options)
  .then(response => response.json())
  .then(data => console.log(data))
  .catch(error => console.error('Error:', error));

import requests
import json

url = "https://api-sandbox.paywithsoap.com/api/v1/checkouts"
headers = {
    "Content-Type": "application/json",
    "Authorization": "Bearer YOUR_API_KEY"
}
data = {
    "customer_id": "cus_vi57KegYgcRqcGHqip8q6UZiqtrwMT870",
    "type": "deposit"
}

response = requests.post(url, headers=headers, json=data)
print(response.json())

{
    "url": "https://wallet-sandbox.paywithsoap.com?clientSecret=HMC3VTosbzJd7cLsoP3geC5QmSz8jqF6",
    "id": "chk_HBq6ExeoRDMPFCCabR8n1h7S1towds7K",
    "client_secret": "HMC3VTosbzJd7cLsoP3geC5QmSz8jqF6",
    "line_items": [],
    "line_items_total_amount_cents": null,
    "balance_amount_cents": null,
    "type": "deposit",
    "fixed_amount_cents": null,
    "experience": null
}

Use this endpoint to create a new checkout session for a customer. Every Soap API request is authenticated with a bearer token in the Authorization header:

Authorization: Bearer YOUR_API_KEY

Your API key is in the Soap Dashboard under the Developers section. It looks like key_.... Requests with a missing or invalid API key return 422 — never 401 — with a JSON error field, usually {"error": "API key not found."}. Branch on the status code rather than the message: GET /api/v1/device_pings/latest_geo_check does not yet return the same wording. Never expose your API key in client-side code — it is server-side only. The type field accepts exactly two values, "deposit" and "withdrawal". The checkout flows below are built from those two values plus the other parameters — there is no "purchase" or "subscription" value for type.

A deposit checkout (type: "deposit") deposits money into a customer’s balance.
A purchase checkout is a deposit that carries line_items, used to buy a product or service such as credits, sweepstakes coins, or digital goods.
A subscription checkout is a deposit that carries line_items and subscription_data, for recurring billing.
A withdrawal checkout (type: "withdrawal") withdraws money from a customer’s balance.

View the Soap Experiences PDF →

Receive Payments

Draft King's Style Deposit

Input form where the customer enters a custom deposit amount.

Preset Amount Deposit

Deposit a fixed amount (e.g. $100) into the customer’s balance.

Subscription Checkout

Create a recurring deposit checkout with subscription billing metadata.

Digital Goods Purchase

Purchase virtual currency, in-game tokens, sweepstakes coins, and other digital goods.

Ecomm Purchase

Purchase physical goods such as nutraceuticals, peptides, supplements, and more.

Send Payments

Balance Withdrawal

Input form where the customer withdraws up to their available balance.

Preset Amount Withdrawal

Withdraw a fixed amount (e.g. $100) from the customer’s balance.

Common Parameters

Parameter	Required	Description
`customer_id`	Yes	Soap customer ID for the customer starting the checkout.
`type`	Yes	Checkout direction. Use `"deposit"` for deposits, purchases, and subscriptions. Use `"withdrawal"` for withdrawals.
`line_items`	Required for purchase and subscription checkouts	Products included in the checkout. Supports existing product references and inline dynamic products.
`subscription_data`	Required for subscription checkouts	Billing cadence for a recurring subscription checkout. Includes `interval` and `interval_count`.
`fixed_amount_cents`	Required for preset amount flows	Fixed amount in cents for preset deposits or preset withdrawals. Must be at least `1`.
`balance_amount_cents`	Required for balance withdrawal flows	Customer balance in cents. The customer can withdraw up to this amount. Must be at least `1`.
`experience`	No	Checkout presentation. Use `"web"`, `"webview"`, or `"iframe"`. Set `"iframe"` when embedding the checkout in an iframe — required for in-frame Apple Pay. See Embedded Checkout.
`return_url`	No	URL where Soap redirects the customer after checkout completion. When the checkout is embedded in an iframe, this redirect happens inside the frame.

Line Items and Dynamic Pricing

Use line_items for purchase and subscription checkout flows where Soap should show purchased products and compute the checkout total from product quantities. Line items are not used for balance amount, fixed amount, or withdrawal-only flows. Each line item can be either:

An existing product reference with product_id and quantity.
An inline dynamic product with name, price_cents, and quantity, plus optional sku, url, and dedup.

When dedup is true, include a stable sku. Soap reuses a matching product for the same business when both sku and price_cents match. If dedup is absent or false, Soap creates a new active product from the inline line item.

Line Item Parameters

Parameter	Required	Description
`line_items[].product_id`	Yes for existing products	Soap product ID for an existing product. Use this shape with `quantity` when the product is already in Soap.
`line_items[].name`	Yes for inline products	Product name to create and display in checkout.
`line_items[].price_cents`	Yes for inline products	Unit price in cents for the inline product. Must be at least `1`.
`line_items[].quantity`	Yes	Number of units to purchase. Must be at least `1`.
`line_items[].sku`	Required when `dedup` is `true`	Stable merchant SKU used with `price_cents` to find an existing product for this business.
`line_items[].url`	No	Product image URL shown in checkout where supported.
`line_items[].dedup`	No	When `true`, Soap looks for an existing product for the same business by `sku` and `price_cents` before creating a new product. Requires `sku`.

Dynamic Purchase Example

{
  "customer_id": "cus_vi57KegYgcRqcGHqip8q6UZiqtrwMT870",
  "type": "deposit",
  "line_items": [
    {
      "name": "Gold Coins Pack",
      "price_cents": 999,
      "quantity": 1,
      "sku": "gold-coins-1000",
      "url": "https://example.com/products/gold-coins.png",
      "dedup": true
    }
  ],
  "experience": "web",
  "return_url": "https://myapp.com/store"
}

Subscription Checkouts

Create a subscription checkout by sending subscription_data on POST /api/v1/checkouts. Subscription checkouts are deposit-only and require line_items. Subscription checkouts use the same line item formats as purchase checkouts: either existing products by product_id or inline dynamic products with name, price_cents, and quantity. The subscription_data.interval value can be day, week, month, or year. For quarterly billing, use interval: "month" and interval_count: 3.

Subscription Parameters

Parameter	Required	Description
`subscription_data.interval`	Yes	Billing interval. Must be `day`, `week`, `month`, or `year`.
`subscription_data.interval_count`	Yes	Number of intervals between charges. Use `interval: "month"` and `interval_count: 3` for quarterly billing.

{
  "customer_id": "cus_aaN5GMMF8CFpsYMuEnN9DPFMtGQaVDQZ",
  "type": "deposit",
  "line_items": [
    {
      "name": "Premium Monthly Plan",
      "price_cents": 2999,
      "quantity": 1,
      "sku": "PREMIUM-MONTHLY",
      "url": "https://images.unsplash.com/photo-1516321318423-f06f85e504b3?auto=format&fit=crop&w=800&q=80",
      "dedup": true
    }
  ],
  "subscription_data": {
    "interval": "month",
    "interval_count": 1
  }
}

curl -X POST 'https://api-sandbox.paywithsoap.com/api/v1/checkouts' \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer YOUR_API_KEY' \
--data '{
    "customer_id": "cus_vi57KegYgcRqcGHqip8q6UZiqtrwMT870",
    "type": "deposit"
}'

require 'net/http'
require 'uri'
require 'json'

uri = URI.parse('https://api-sandbox.paywithsoap.com/api/v1/checkouts')
request = Net::HTTP::Post.new(uri)
request.content_type = 'application/json'
request['Authorization'] = 'Bearer YOUR_API_KEY'
request.body = {
  customer_id: 'cus_vi57KegYgcRqcGHqip8q6UZiqtrwMT870',
  type: 'deposit'
}.to_json

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(request)
end

puts response.body

const fetch = require('node-fetch');

const options = {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer YOUR_API_KEY'
  },
  body: JSON.stringify({
    customer_id: 'cus_vi57KegYgcRqcGHqip8q6UZiqtrwMT870',
    type: 'deposit'
  })
};

fetch('https://api-sandbox.paywithsoap.com/api/v1/checkouts', options)
  .then(response => response.json())
  .then(data => console.log(data))
  .catch(error => console.error('Error:', error));

import requests
import json

url = "https://api-sandbox.paywithsoap.com/api/v1/checkouts"
headers = {
    "Content-Type": "application/json",
    "Authorization": "Bearer YOUR_API_KEY"
}
data = {
    "customer_id": "cus_vi57KegYgcRqcGHqip8q6UZiqtrwMT870",
    "type": "deposit"
}

response = requests.post(url, headers=headers, json=data)
print(response.json())

{
    "url": "https://wallet-sandbox.paywithsoap.com?clientSecret=HMC3VTosbzJd7cLsoP3geC5QmSz8jqF6",
    "id": "chk_HBq6ExeoRDMPFCCabR8n1h7S1towds7K",
    "client_secret": "HMC3VTosbzJd7cLsoP3geC5QmSz8jqF6",
    "line_items": [],
    "line_items_total_amount_cents": null,
    "balance_amount_cents": null,
    "type": "deposit",
    "fixed_amount_cents": null,
    "experience": null
}

Redirect the customer to url, or embed it in an <iframe allow="payment"> to render checkout in context. See Embedded Checkout.

subscription is only present when you created a subscription checkout. It is omitted from the response entirely otherwise, rather than returned as null, so check whether the key exists instead of comparing it to null. This differs from webhook payloads, where data.subscription is always present and is null for non-subscription checkouts.

Authorizations

Authorization

string

header

required

Bearer token authentication using your API key (key_...). Used for every endpoint except POST /api/v1/device_pings.

Body

application/json

Standard sports-book styles deposit.

customer_id

string

required

Unique identifier for the customer

Example:

"cus_vi57KegYgcRqcGHqip8q6UZiqtrwMT870"

type

enum<string>

required

Type of transaction - deposit

Available options:

deposit

Example:

"deposit"

experience

enum<string>

The experience type for the checkout flow. Use "iframe" when embedding the checkout in an iframe.

Available options:

web,

webview,

iframe

return_url

string

URL to redirect the customer after completion (if you are opening a new tab or window for your customer you do not need this)

Example:

"https://myapp.com/game/:id"

Response

Use the url field in the response. In web, you can redirect or open a new tab. In native, you can use a WebView.

url

string

The url of the checkout experience

string

Unique identifier for the checkout

client_secret

string

Secret used for client-side checkout processing

line_items

object[]

Line items contained in the checkout (non-empty only for purchases)

Show child attributes

line_items_total_amount_cents

integer | null

Total amount in cents for all line items

balance_amount_cents

integer | null

Amount in cents withdrawn from or to be added to balance

type

enum<string>

Type of checkout transaction

Available options:

deposit,

withdrawal

fixed_amount_cents

integer | null

A merchant-set amount that locks the checkout to a single value. Always present in the response, and null unless your account is configured for fixed-amount flows. Mutually exclusive with both line_items and balance_amount_cents.

experience

enum<string>

The experience type for the checkout flow. Use "iframe" when embedding the checkout in an iframe.

Available options:

web,

webview,

iframe

subscription

object

Subscription metadata. This key is omitted entirely for non-subscription checkouts rather than being returned as null, so check for its presence rather than comparing it to null.

Show child attributes

API Documentation

API Endpoints

Webhooks

Testing

Create Checkout

Receive Payments

Draft King's Style Deposit

Preset Amount Deposit

Subscription Checkout

Digital Goods Purchase

Ecomm Purchase

Send Payments

Balance Withdrawal

Preset Amount Withdrawal

Common Parameters

Line Items and Dynamic Pricing

Line Item Parameters

Dynamic Purchase Example

Subscription Checkouts

Subscription Parameters

Authorizations

Body

Response

​Receive Payments

Draft King's Style Deposit

Preset Amount Deposit

Subscription Checkout

Digital Goods Purchase

Ecomm Purchase

​Send Payments

Balance Withdrawal

Preset Amount Withdrawal

​Common Parameters

​Line Items and Dynamic Pricing

​Line Item Parameters

​Dynamic Purchase Example

​Subscription Checkouts

​Subscription Parameters

Authorizations

Body

Response

Receive Payments

Send Payments

Common Parameters

Line Items and Dynamic Pricing

Line Item Parameters

Dynamic Purchase Example

Subscription Checkouts

Subscription Parameters