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Square Connect Flutter

This project is a wip extending the Square Connect APIs. You can learn more about them here

Getting Started

First, ensure you've added the dependency to your project

    square-connect: <latest-version>


Start by getting an instance of the SquareConnect client

var client = SquareConnect.instance;

Then set two config options:

REQUIRED First, enter your developer token. You can find this at (More/better authentication options planned for the future).

client.setAuthToken(token: 'YOUR-TOKEN-HERE');

ALTERNATIVELY You can combine the .instance and the setAuthToken(token) to one call that does both, which is often more convenient.


OPTIONAL Second, you may add a different HttpClient to use. By defauly, the IOClient is used (the object that flutter needs to make http calls). This is useful for testing (you can enter a Mock client) or using BrowserClient if developing for web.

var httpClient = BrowserClient();
client.setAuthToken(client: httpClient);

ADITIONAL TIP If using Flutter, and excelent strategy is to use the Provider package to manage the SquareConnect client. You can initalize like so :

  value: SquareConnect.getInstanceWithToken('YOUR-TOKEN-HERE'),
  child: MaterialApp(
    home: Home(),

and then retrieve anywhere in the widget tree like so:


This way, you only need to enter your token once, and you can use the same client anywhere your app. Of course, you could use a MultiProvider intead if you had multiple items to provide.


Now that you have a SquareConnect client set up, you can access it's methods. The seperate APIs are contained in their own objects for better organization. For example, to access the Catalog API, you can use:



Instead of throwing errors caused by Square's API, methods return a list of errors returned by Square's API. To check if errors were thrown, you can call .hasErrors on the Response object, or simply check if the errors property is null.


var response = await client.catalogApi.retrieveCatalogObject(objectId: 'fake-obj-id');
if (response.hasErrors) {
  // at least 1 error occured
  response.errors.forEach((error) => print(error.detail));
} else {
  // no errors occured, you can access your payload
  var object = response.object;


On methods that support it, you can paginate your calls. On some calls, there are hard limits to how many items can be returned (eg. listCatalog() can return 200 objects by default). You can programatically find limits with the getCatalogInfo() method.

If pagination is supported/needed, the response will contain a cursor string returned by Square's API. To retrieve it, you can call response.cursor. If the field is null, then no cursor exists and there are no more items to be returned. If it was not null, you can pass it into another call of the specific method.

Of course you can use this cursor for lazy loading or write a recursive function to get all objects either time. We build the pagination exactly as Square implements it to allow for flexibility.


List<CatalogObject> listOfObjects = [];

var firstResponse = await client.catalogApi.listCatalogObjects();
if (firstResponse.cursor != null) {
  // Max elements for this call, but there are more to return
  var secondResponse = await client.catalogApi.listCatalogObjects(cursor: firstResponse.cursor);
  if (secondResponse.cursor != null) {
    // could go on more, could write function recursivly
  } else {
    // All the elements have been returned

Methods Supported (for more info, see API documentation, and Square's documentation):

Catalog API (SquareConnect.catalogApi)

listCatalog(types, cursor)Gets all catalog objects, can filter with specifying types list and pagination support.
retrieveCatalogObject(objectId, includeRelatedObjects)Gets specified catalog object by id.
deleteCatalogObject(objectId)Deletes secified catalog object by id.
batchDeleteCatalogObjects(objectIds)Batch deletes catalog objects from list of ids.
getCatalogInfo()Gets metadata about catalog.
searchCatalogObjects(various inputs)Seaches catalog objects in a variety of ways. See documentation.
batchUpsertCatalogObjects(batches)Creates or updates catalog objects in bulk.
batchRetrieveCatalogObjects(objectIds, includeRelatedObjects)Retrieves Catalog Objects in bulk.
upsertCatalogObject(object)Creates or updates a catalog object.
updateItemModifierLists(itemIds, modifierListsToEnable, modifierListsToDisable)Seaches catalog objects in a variety of ways. See documentation.
updateItemTaxes(itemIds, taxesToEnable, taxesToDisable)Updates the taxes that apply to an item.

Customer API (SquareConnect.customerApi)

createCustomer(various inputs)Creates a customer object with specified information and returns the created customer.
createCustomerCard(customerId, card inputs)Creates a card on file for specified customer and returns the created card.
deleteCustomer(customerId)Deletes secified customer object by id.
deleteCustomerCard(customerId, cardId)Deletes secified card on file belonging to customer by id.
listCustomers(cursor, sortField, sortOrder)Lists customers by optional cursor, sort field, and sort order.
retrieveCustomer(customerId)Retrieves customer object by id.
searchCustomers(various query inputs, cursor, limit)Searches for customer by filters and sorts, as well as cursor and limit.
updateCustomer(customerId, various inputs)Updates specified customer object (by id) and returns the created customer.

Locations API (SquareConnect.locationsApi)

listLocations()Lists all a merchant's locations.

Orders API (SquareConnect.ordersApi)

createOrder(various inputs)Creates and order from Catalog ids. Custom line items not yet supported.
searchOrders(various inputs)Searches for orders with different filter and sorting options.
batchRetrieveOrders(locationId, orderIds)Retrieves one or more orders given their Order ID.
updateOrder(various inputs)Updates an order given a Order Id and version.
payOrder(various inputs)Pays for an order with either multiple payment ids or a 0 balance.

Payments API (SquareConnect.paymentsApi)

listPayments(various inputs)Lists payments meeting certain crieteria.
createPayment(various inputs)Creates and optionally processes a payment from card on file or in app payments sdk.
cancelPaymentByIdempotencyKey(idempotencyKey)Cancels a payment by given idempotency key.
getPayment(paymentId)Retrieves a payment given its id.
cancelPayment(paymentId)Cancels a payment given its id.
completePayment(paymentId)Completes a payment given its id.

Refunds API (SquareConnect.refundsApi)

listPaymentRefunds(various inputs)Lists payment refunds meeting certain crieteria.
refundPayment(various inputs)Refunds a payment given a payment id and amounts to refund.
getPaymentRefund(paymentRefundId)Retrieves a payment refund given its id.

Employees API (SquareConnect.employeesApi)

listEmployees(locationId, status, limit, cursor,)Gets a list of Employee objects for a business.
retrieveEmployee(employeeId)Gets an Employee from Employee Id.

Inventory API (SquareConnect.inventoryApi)

batchChangeInventory(various inputs)Changes the inventory of multiple items in bulk.
batchRetrieveInventoryChanges(various inputs)Retrieves inventory changes in bulk from various inputs.
batchRetrieveInventoryCounts(various inputs)Retrieves inventory counts in bulk from various inputs.
retrieveInventoryAdjustment(adjustmentId)Retrieves an inventory adjustment given its id.
retrieveInventoryChanges(catalogObjectId, locationIds)Retrieves inventory changes to a catalog object given its id some locations.
retrieveInventoryCount(catalogObjectId, locationIds)Retrieves inventory counts for a catalog object given its id some locations.
retrieveInventoryPhysicalCount(catalogObjectId, locationIds)Retrieves inventory counts for a catalog object given its id some locations.

Labor API (SquareConnect.laborApi)

createBreakType(various inputs)Creates a break type.
createShift(various inputs)Creates a shift for an employee.
deleteBreakType(breakTypeId)Deletes a break type by its id.
deleteShift(shiftId)Deletes a shift by its id.
getBreakType(breakTypeId)Retrieves a break type by its id.
getEmployeeWage(employeeWageId)Retrieves an employee wage by its id.
getShift(shiftId)Retrieves a shift by its id.
listBreakTypes(various inputs)Lists the break types at a location.
listEmployeeWages(various inputs)Lists the employee wages for an employee.
listWorkweekConfigs(limit, cursor)Lists the workweek configs for a business.
seachShifts(various inputs)Searches for shifts based on the inputs.
updateBreakType(various inputs)Updates a break type by its id.
updateShift(various inputs)Updates a shift by its id.
updateWorkweekConfig(various inputs)Updates a workweek config based on its id.

Transactions API (SquareConnect.transactionsApi)

NOTE: This set of APIs has been deprecated by Square.

captureTransaction(locationId, transactionId)Fully processes Transaction when deloyCapture is set to true in the charge() method.
charge(various inputs)Charges a card represented by a card nonce or a customer's card on file.
createRefund(various inputs)Retrieves one or more orders given their Order ID.
listRefunds(various inputs)Lists refunds for one of a business's locations.
listTransactions(various inputs)Lists transactions for a particular location.
retrieveTransaction(locationId, transactionId)Retrieves details for a single transaction.
listRefunds(various inputs)Cancels a Transaction that was created with the charge() method with a delayCapture value of true.