# Receipts API Integration Guide The primary objective of this integration is to send as much customer, transaction, tender and item information, as possible to flexEngage. flexEngage then digitizes the entire transaction for the end consumer, and provides detailed statistics & analytics for the merchant. This Integration Guide provides integrators with detailed descriptions on how to connect with and test the flexEngage web services. This guide does not provide instructions on Point of Sale (POS) specific integration steps. ## In This Guide * **Receipts API Integration Guide** — authentication, request/response flow, error handling, and best practices. * [Request Field Reference](/receipts/request-reference.html) — field-by-field usage notes for headers, discounts, loyalty, tenders, taxes, items, custom fields, and more. * [Receipt Data Elements](/receipts/receipt-data-elements.html) — how request fields map to sections of a rendered receipt (orders, returns, totals, deposits, payment history, and more). * [Point of Sale UI Guidelines](/receipts/pos-ui-guidelines.html) — recommended configuration options and UI flow. * [Printed Offers](/receipts/printed-offers.html) — for merchants whose package includes printed offers. * [SMS Receipts](/receipts/sms-receipts.html) — for merchants whose package includes SMS delivery. * [Integration Testing Checklist](/receipts/testing-checklist.html) — validate your integration before launch. ## Introduction ### Intended Audience This guide is for an integrator/developer that is looking to integrate a Point of Sale (POS) system with the flexEngage web services. This integration provides digital receipts to consumers as part of the checkout process. This document should be used in conjunction with the *flexEngage Integration Test Guide*, which provides steps to test the POS integration and ensure the digital receipt functionality performs as expected. The Technical Services team will provide you with the flexEngage Integration Test Guide. ### Web Services Info #### API Specification The schema for this web service is published as an OpenAPI 3 specification — see the [Receipts API](/receipts-api.html). #### Endpoints The Technical Services team will provide you with the endpoint connectivity information for both the test and production environments through the *Merchant Access Form*. **Test:** `https://api-test.flexreceipts-lab.com/ws/rest/v1/merchants/[MERCHANT-ID]/receipts` (*Note: Replace [MERCHANT-ID] with the merchant ID that was provided by flexEngage.*) **Production:** The endpoint for the production environment is given at the time of production deployment as coordinated with flexEngage. The fully-qualified absolute URL of the endpoint/s should be configurable values on the POS to allow flexibility — move from one environment to another (e.g., test environment to production environment). #### SSL Certificates All communication with flexEngage web services are done over an encrypted **TLS connection**. For performance purposes and because of the "Poodle" vulnerability with SSL v3.0, flexEngage is optimized for TLS 1.2. The POS should use the **root certificate** and not sub certificates for api.flexreceipts.com or api-test.flexreceipts.com. #### TLS/SNI Support You should be using a TLS implementation that supports Server Name Identification (SNI). If you do not, you could encounter certificate issues with one or more of our environments. Contact flexEngage if your TLS implementation does not support SNI. #### Web Service Authentication flexEngage provides the Merchant with API keys to be used as credentials for all web service requests. Credentials must be transmitted using HTTP Basic Authentication. Depending upon the programming language used, there should be a library which makes this easy to do. #### Receipt Language flexEngage uses store locale mappings to determine receipt language. To use this feature, you must: * Share your store group locales with flexEngage Technical Services. The flexEngage Technical Services team will map those stores to groups with the correct localization. * Example, store #9999 is in Montreal, so it needs to be in the fr_CA store group to get the fr_CA version of the receipt. * Send the ISO 2 character language abbreviation (en_US, en_CA, es_ES) as "Accept-Language" in the http header of the Receipt message. * Using this header will override any localization configurations in the first bullet point. ```http Accept-Language: fr_CA Content-Length: 11195 Host: api.flexEngage.com:443 Connection: Keep-Alive User-Agent: Apache-HttpClient/4.1.1 (java 1.5) Authorization: Basic YUdjMGRtdHdiR0YzZDFZNEs……. ``` ### Configurability The POS integration with flexEngage (e.g., Web Services, POS UI) should be configurable so that operations can be modified without code changes. See [Point of Sale UI Guidelines](/receipts/pos-ui-guidelines.html) for examples of features that should be configurable. ### Testing Info In order to test with flexEngage you must contact flexEngage Support to setup a test account. flexEngage must be notified in advance of any testing in the flexEngage integration test environment. Contact your flexEngage representative for instructions on how to contact flexEngage Support. **NOTE: Testing in the flexEngage Production environment is strictly prohibited. All production deployments must be coordinated with the flexEngage team ahead of time, and a flexEngage representative must be involved with the deployment.** **In the event that post-deployment production troubleshooting (that cannot be satisfied in the flexEngage test environment) is required, the integrator must submit a written request to flexEngage to schedule a limited test against the flexEngage production environment. The following restrictions apply to all testing requests:** * **No automated or high volume testing.** * **Only flexEngage approved versions of integration code can be used to communicate with the flexEngage production environment;** * **All code changes must be tested with flexEngage in the test environment prior to being deployed to the production environment.** * **Testing scope and timeframe should be documented in writing and should include:** * **Date and time of the test.** * **Duration of the test.** * **Number of locations and registers (POS) involved in the test.** * **Number of transactions by transaction type that will be sent.** * **A copy of the written test plan that includes the test cases/scenarios that will be run.** #### Fake Email Addresses **Intentionally sending fake email addresses when testing is prohibited.** flexEngage recommends that you register a test domain name and create a test "catch-all" email account where any email sent to that domain is sent to the "catch-all" email account. This allows you to create an unlimited number of valid test email addresses. Most email providers have this feature. Below is a screenshot of that setting in Godaddy email. For additional information please contact flexEngage Support. **Catch-all setting in Godaddy email** ![Catch-all setting in Godaddy email](/receipts/images/godaddy-catch-all-email.png) ### Offline Mode If the API is not reachable (e.g., store network connectivity is down), then failed API requests should queued up and sent when access to the API is available again. This can be accomplished by setting up a folder where failed API requests are stored and reprocessed from when access to the API is restored. ## Receipt Process Flow There is one (1) main service that the POS uses to create a digital receipt: **Receipt** This service sends as much customer, transaction, tender and item information, as possible to flexEngage. flexEngage then digitizes the entire transaction for the end consumer, and provides detailed statistics & analytics for the merchant.
Receipt Request POS sends transaction information to flexEngage and determines whether to generate a digital receipt.
Receipt Response flexEngage returns a message to the POS, providing a digital receipt confirmation or errors/warnings.

NOTE: The POS should not close out the transaction until the Receipt Response is received and processed.
The flow below gives an overview of how flexEngage expects to interact with the POS during the checkout process. ![Receipt process flow diagram](/receipts/images/receipt-process-flow.png) **Process Flow Step Breakdown:** **Step 1:** The POS tenders the current transaction. **Step 2:** The POS prompts the Customer or Cashier for receipt type (i.e., Digital Only, Digital and Paper, or Paper Only). **Step 3:** For 'Digital Only' and 'Digital and Paper', either the Customer enters their email address OR the POS automatically populates the Customer's email address from its database. **Step 4:** The POS issues a *Request* web service call to flexEngage. **Step 5:** flexEngage replies to the POS with a *Response* **Step 6:** The POS processes the *Response* in 1 of 4 conditions: **6A:** 'Digital Only' Success - A 'Digital Only' request was received and successfully processed. **6B:** 'Digital and Paper' Success - A 'Digital and Paper' request was received and successfully processed. **6C:** 'Paper Only' Success - A 'Paper Only' request was received and successfully processed. **6D:** Error - An error occurred that prevented a digital receipt from being processed. **Steps 7:** The POS may need to display a confirmation message. **7A:** The POS displays a confirmation message, *"A digital copy of the receipt has been sent to the customer."* **7B:** The POS displays a confirmation message, *"A digital copy of the receipt has been sent to the customer."* **7D:** An error occurred. The POS displays a notification message, *"The digital receipt service is unavailable. A paper receipt will be printed."* **Step 8:** The POS may need to print a paper receipt. **8B:** Since the customer requested both a 'Digital and Paper' receipt, the POS must also print a paper receipt. **8C:** Since the customer requested a 'Paper Only' receipt, the POS must print a paper receipt. **8D:** Since an error occurred, a digital receipt cannot be created, and the POS must print a paper receipt. **Step 9:** The POS proceeds with the next transaction. ***NOTE:*** *The web service call follows a request/response protocol. Your integration is expected to read and process the flexEngage service responses. The responses contain info needed for your POS workflow.* ## Receipt Service (Sending the Digital Receipt) The purpose of this service is to send customer, transaction, tender and item information to flexEngage. The entire transaction is then digitized for the end consumer. Detailed statistics and analytics are provided to the merchant. **Request:** This is the web service call made by the POS to send transaction information to flexEngage. It determines whether to generate a digital receipt. **Response:** This message is returned by flexEngage to provide the POS with additional instructions for if printing a receipt is required and to communicate a digital receipt confirmation or error/warning message. ***NOTE: The POS should not close out the transaction until the Response is received and processed.*** ### Request You should be familiar with the Request JSON message. Refer to [`POST /merchants/{merchantId}/receipts`](/receipts-api.html#post-/merchants/-merchantId-/receipts) in the [Receipts API](/receipts-api.html) reference for a full description of all the elements. #### Request Message The Request Message is an REST web service call and the JSON contains 4 types of data: * Customer Information * Receipt / Transaction Information * Store Information * Workstation Information Customer, Receipt/Transaction, Store, and Workstation Information varies depending on the transaction. Specific examples on how to send these elements are addressed in the [Request Field Reference](/receipts/request-reference.html) and [Receipt Data Elements](/receipts/receipt-data-elements.html). #### Request Field Reference Review the complete JSON in the [Receipts API](/receipts-api.html) reference for complete information. See the [Request Field Reference](/receipts/request-reference.html) for the areas that require special attention. ### Response #### Response Message The *Response* Message is sent in response to your *Request*. See the [Receipts API](/receipts-api.html) reference for the response schema. Below are some examples of error messages. ##### SUCCESS - Digital Only, and Digital and Paper
SAMPLE MESSAGENOTES
 
{
  "customerEmailAddress": "JANE.DOE@EMAIL.COM",
  "receiptId": "773ac1fe-8927-4977-b488-246d0adadadf"
}
 HTTP Status: 200

This response is sent when a transaction is successfully received by flexEngage. A unique ReceiptID is returned that can be used with the flexEngage PDF retrieval web service to get a PDF version of the receipt for printing. Display a POS confirmation message stating: "A digital copy of the receipt has been sent to the customer."
##### SUCCESS - Paper Only
SAMPLE MESSAGENOTES
 
{
  "customerEmailAddress": null,
  "receiptId": "773ac1fe-8927-4977-b488-246d0adadadf"
}
 HTTP Status: 200

This response is sent when a transaction is successfully received by flexEngage. A unique ReceiptID is returned that can be used with the flexEngage PDF retrieval web service to get a PDF version of the receipt for printing. DO NOT Display a POS confirmation message stating: "A digital copy of the receipt has been sent to the customer."
##### ERROR - Invalid Merchant ID
SAMPLE MESSAGENOTES
 
{
  "message": "Unauthorized Access",
  "code": null,
  "referenceId": "87d29ffb-8fdb-4d22-88a2-0b40ecbd4b2f",
  "errors": {}
}
 HTTP Status: 403

This response is received if a Merchant ID is invalid or inactive.
##### ERROR - Data Error, including validation errors
SAMPLE MESSAGENOTES
 
{
  "message": "Validation error",
  "code": null,
  "referenceId": "1d7f54e4-67d6-41c2-a590-ac0ae72df10a",
  "errors": {
    "receiptDateTime": [
      { "code": null, "message": "must use ISO 8061 date format." }
    ]
  }
}
 HTTP Status: 422

This response is received if there is a problem with the data in the Request and flexEngage cannot process it. In this case, the receipt date was sent in the incorrect format. Display a POS error message stating: "The Digital Receipt service is currently not available. A paper receipt will be printed." A paper receipt must be printed for the customer.
## Common Mistakes to Avoid This document makes some assumptions that the integrator should be aware of and conform to. You can greatly reduce your effort by reading this section as it contains steps to avoid the most common reasons for re-work and troubleshooting: * **Do Not Send unused elements that are blank**. Do not return empty elements or elements with filler data (e.g., "0.00"). This helps keep the messages lean and efficient. * **Enumerations Matter.** When sending data as elements defined as enumerations, you must send the data EXACTLY as defined in the enumeration (case sensitive). * **firstName and lastName in creditDebit are for Credit/Debit Card authentication only.** They are for the name on the Credit card and must be track data. Do not populate them from customer records in the POS. * **barcodeType is for the receipt barcode, not item SKU.** If you print barcodes on the bottom of your receipt, you need to specify which enumeration matches the barcode type you use. * **transactionNumber is the unique number of the receipt (or transaction).** * **barcodeNumber is for the number used to generate the receipt Barcode. It is not the Transaction number.** * **barcodeNumber must be compatible with barcodeType.** If you are using a barcode that require 12 digits, you must pad your receipt number to fill 12 digits. If `` does not matter to you, use a variable length type like Code128. If `` is blank, flexEngage defaults to "Code128". ## Common Error Responses Below are some example response messages for common error conditions. The integrations' ability to log or respond to these can greatly speed up troubleshooting.
HTTP Authentication Error — 401 Unauthorized
{
  "message": "Authentication Failed",
  "code": "auth_failure",
  "referenceId": "7862c339-9202-4863-be79-ec9bb97d28e9",
  "errors": {}
}
Merchant ID Inactive / Incorrect Merchant ID — 403 Forbidden
{
  "message": "Unauthorized Access",
  "code": null,
  "referenceId": "bd16b475-25e3-4361-bb3f-6fbf54587f0d",
  "errors": {}
}
Missing Required Element (Item Name Example) — 422 Unprocessable Entity
{
  "message": "Validation error",
  "code": null,
  "referenceId": "44c2d3c9-32a4-472a-9898-5a4a495ee51a",
  "errors": {
    "items[0].name": [
      { "code": null, "message": "may not be null" }
    ]
  }
}
Max Length Exceeded (Store Name Example) — 422 Unprocessable Entity
{
  "message": "Validation error",
  "code": null,
  "referenceId": "deac476c-d55b-47d0-9d14-085d540ea448",
  "errors": {
    "workstation.store.name": [
      { "code": null, "message": "size must be between 1 and 100" }
    ]
  }
}
Invalid Format (Receipt Date & Revision Date Example) — 422 Unprocessable Entity
{
  "message": "Validation error",
  "code": null,
  "referenceId": "4efcb6fb-df32-48a9-97aa-2002aadd6ccd",
  "errors": {
    "revision.dateTime": [
      { "code": null, "message": "must use ISO 8061 date format." }
    ]
  }
}