Call Amadeus flight-offers-pricing API from R? - r

Question

Update:
Here is code that shows how to get an access token. I also use the test api here which is free (no credit card required).
The first api call to test.api.amadeus.com/v2/shopping/flight-offers is shown.
It is the second api call to test.api.amadeus.com/v1/shopping/flight-offers/pricing api that I don't know how to format.
My question remains, what is the correct way to call the second API using R?
R Script
library("tidyverse")
library("httr")
library("rjson")
amadeus_api_key_prod <- Sys.getenv("AMADEUS_API_KEY")
amadeus_api_secret_prod <- Sys.getenv("AMADEUS_SECRET")
# Initialize variables
tmp_origin <- NULL
tmp_dest <- NULL
tmp_avg_total_fare <- NULL
# Get Token
response <- POST("https://test.api.amadeus.com/v1/security/oauth2/token",
add_headers("Content-Type" = "application/x-www-form-urlencoded"),
body = list(
"grant_type" = "client_credentials",
"client_id" = amadeus_api_key_prod,
"client_secret" = amadeus_api_secret_prod),
encode = "form")
response
rsp_content <- content(response, as = "parsed", type = "application/json")
access_token <- paste0("Bearer ", rsp_content$access_token)
origin <- "JFK"
dest <- "LHR"
dep_date <- "2021-12-01"
return_date <- "2021-12-18"
max_num_flights <- 1
url <- paste0("https://test.api.amadeus.com/v2/shopping/flight-offers?originLocationCode=",
origin,
"&destinationLocationCode=",
dest,
"&departureDate=",
dep_date,
"&returnDate=",
return_date,
"&max=",
max_num_flights,
"&adults=1&nonStop=false&travelClass=ECONOMY&max=1&currencyCode=CAD")
# Get flight info
response <- GET(url,
add_headers("Content-Type" = "application/x-www-form-urlencoded",
"Authorization" = access_token),
encode = "form")
response
rsp_content <- content(response, as = "parsed", type = "application/json")
rsp_content
# Get current, more detailed flight info
# This is the part I do not know how to do
url2 <- "https://test.api.amadeus.com/v1/shopping/flight-offers/pricing"
flt_info <- toJSON(rsp_content[["data"]])
response2 <- GET(url2,
add_headers("Authorization" = access_token),
body = list(
"priceFlightOffersBody" = flt_info
),
encode = "form")
response2
rsp_content2 <- content(response2, as = "parsed", type = "application/json")
rsp_content2
Original Question
I am using the Amadeus flight info api to retrieve prices for flights.
My understanding is that to get complete price info requires two steps.
Call to https://api.amadeus.com/v2/shopping/flight-offers api
Call to https://api.amadeus.com/v1/shopping/flight-offers/pricing api
I can successfully perform the first api call with origin, destination, dates, etc.
The second call, confirms the pricing is still available and has a more detailed breakdown of the fare than does the first api call. It is this detailed breakdown that I am most interested in.
I am having trouble understanding what info that gets returned from the first api call needs to be passed to the second api call and in what format.
Below, I have included the data structure that gets returned from the first api call and my failed attempt to call the second api.
What is the correct way to call the second API using R?
Links to what I believe is the relevant documentation:
https://developers.amadeus.com/self-service/category/air/api-doc/flight-offers-price/api-reference
https://github.com/amadeus4dev/amadeus-code-examples/blob/master/flight_offers_price/v1/post/curl/flight_offers_price.sh
# Data structure returned from call to https://api.amadeus.com/v2/shopping/flight-offers
# For YYZ to YOW return, Dec 1-18 economy
rsp_content <- list(meta = list(count = 1L, links = list(self = "https://api.amadeus.com/v2/shopping/flight-offers?originLocationCode=YYZ&destinationLocationCode=YOW&departureDate=2021-12-01&returnDate=2021-12-18&max=1&adults=1&nonStop=false&travelClass=ECONOMY&max=1&currencyCode=CAD")),
data = list(list(type = "flight-offer", id = "1", source = "GDS",
instantTicketingRequired = FALSE, nonHomogeneous = FALSE,
oneWay = FALSE, lastTicketingDate = "2021-08-07", numberOfBookableSeats = 7L,
itineraries = list(list(duration = "PT1H10M", segments = list(
list(departure = list(iataCode = "YYZ", terminal = "3",
at = "2021-12-01T11:00:00"), arrival = list(iataCode = "YOW",
at = "2021-12-01T12:10:00"), carrierCode = "WS",
number = "3462", aircraft = list(code = "DH4"),
duration = "PT1H10M", id = "1", numberOfStops = 0L,
blacklistedInEU = FALSE))), list(duration = "PT1H21M",
segments = list(list(departure = list(iataCode = "YOW",
at = "2021-12-18T10:45:00"), arrival = list(iataCode = "YYZ",
terminal = "3", at = "2021-12-18T12:06:00"),
carrierCode = "WS", number = "3463", aircraft = list(
code = "DH4"), duration = "PT1H21M", id = "2",
numberOfStops = 0L, blacklistedInEU = FALSE)))),
price = list(currency = "CAD", total = "232.78", base = "125.00",
fees = list(list(amount = "0.00", type = "SUPPLIER"),
list(amount = "0.00", type = "TICKETING")), grandTotal = "232.78"),
pricingOptions = list(fareType = list("PUBLISHED"), includedCheckedBagsOnly = FALSE),
validatingAirlineCodes = list("WS"), travelerPricings = list(
list(travelerId = "1", fareOption = "STANDARD", travelerType = "ADULT",
price = list(currency = "CAD", total = "232.78",
base = "125.00"), fareDetailsBySegment = list(
list(segmentId = "1", cabin = "ECONOMY", fareBasis = "LAVD0TBJ",
brandedFare = "BASIC", class = "E", includedCheckedBags = list(
quantity = 0L)), list(segmentId = "2",
cabin = "ECONOMY", fareBasis = "LAVD0ZBI",
brandedFare = "BASIC", class = "E", includedCheckedBags = list(
quantity = 0L))))))), dictionaries = list(
locations = list(YOW = list(cityCode = "YOW", countryCode = "CA"),
YYZ = list(cityCode = "YTO", countryCode = "CA")),
aircraft = list(DH4 = "DE HAVILLAND DHC-8 400 SERIES"),
currencies = list(CAD = "CANADIAN DOLLAR"), carriers = list(
WS = "WESTJET")))
# Get full pricing info
url2 <- "https://api.amadeus.com/v1/shopping/flight-offers/pricing"
# Get pricing info
response2 <- GET(url2,
add_headers("Authorization" = access_token),
body = list(
"priceFlightOffersBody" = rsp_content[["data"]][[1]]
),
encode = "form")
response2
rsp_content2 <- content(response2, as = "parsed", type = "application/json")
rsp_content2

Answer 1

You can take a look at this blog article, it explains how the data needs to be passed between the 3 endpoints and it has a video showing it on Postman.
You can check some of the code samples the Amadeus for Developers team has built. Here for Flight Offers Price (in different programming languages but not R) and here for Flight Create Orders (that includes the previous steps of search and price).
They have a couple of demo applications as well that show you how to combine these endpoints to build a flight booking engine, one of them in Python that you can find here.

Answer 2

It seems to work with the following, for the second request.
Changes :
Use POST, not GET
While the documentation names the body priceFlightOffersBody, it should actually be just the data part, no need to encapsulate in another list.
The data part is not exactly the same as the result of the first request.
Pass the data part as an R list and use POST argument encode = "json".
url2 <- "https://test.api.amadeus.com/v1/shopping/flight-offers/pricing"
flt_info <- list(data = list(type = "flight-offers-pricing",
flightOffers = rsp_content$data))
response2 <- POST(url2,
add_headers(Authorization = access_token),
body = flt_info,
encode = "json")
rsp_content2 <- content(response2, as = "parsed", type = "application/json")
rsp_content2