diff --git a/NEWS.md b/NEWS.md
index 07e82eae..851fa8ab 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,23 +1,34 @@
 # ichimoku 1.4.11.9000 (development)
 
+#### Updates:
+
 * Uses 'mirai' to run `oanda_studio(new.process = TRUE)`
-* Fixes `oanda_switch()`, regression since v1.4.11.
+* Fixes `oanda_switch()` after a regression in 1.4.11.
 * Updates internal OANDA instruments list.
 * Internal performance enhancements.
 
 # ichimoku 1.4.11
 
+#### New features:
+ 
 * Allows using the environment variable 'OANDA_API_KEY' as an alternative to the 'keyring' package.
+
+#### Updates:
+
 * Arguments 'keep.data' and 'keep.attrs' across the package now have an explicit default value of FALSE (no resultant change in behaviour).
 * Internal performance enhancements.
 * Requires nanonext >= 0.11.0.
 
 # ichimoku 1.4.10
 
+#### Updates:
+
 * Improves handling of OANDA API errors.
 
 # ichimoku 1.4.9
 
+#### Updates:
+
 * Internal performance enhancements.
 * Requires nanonext >= 0.10.0 and R >= 3.5.
 
diff --git a/R/iplot.R b/R/iplot.R
index 951b48d4..c8b4ca4e 100644
--- a/R/iplot.R
+++ b/R/iplot.R
@@ -124,7 +124,7 @@ iplot <- function(x,
 
   server <- function(input, output, session) {
 
-    window <- reactive(paste0(input$dates[1L], "/", input$dates[2L]))
+    window <- reactive(sprintf("%s/%s", input$dates[1L], input$dates[2L]))
     left_px <- reactive(input$plot_hover$coords_css$x)
     top_px <- reactive(input$plot_hover$coords_css$y)
     posi_x <- reactive(round(input$plot_hover$x, digits = 0))
diff --git a/R/oanda.R b/R/oanda.R
index 152efb72..bf603935 100644
--- a/R/oanda.R
+++ b/R/oanda.R
@@ -186,12 +186,13 @@ oanda <- function(instrument,
 getPrices <- function(instrument, granularity, count = NULL, from = NULL,
                       to = NULL, price, server, apikey, .validate) {
 
-  url <- paste0("https://api-fx", switch(server, practice = "practice", live = "trade"),
-                ".oanda.com/v3/instruments/", instrument, "/candles?granularity=",
-                granularity, "&price=", price,
-                if (length(count)) strcat("&count=", as.character(count)),
-                if (length(from)) strcat("&from=", as.character(from)),
-                if (length(to)) strcat("&to=", as.character(to)))
+  url <- sprintf(
+    "https://api-fx%s.oanda.com/v3/instruments/%s/candles?granularity=%s&price=%s%s%s%s",
+    switch(server, practice = "practice", live = "trade"), instrument, granularity, price,
+    if (length(count)) strcat("&count=", as.character(count)) else "",
+    if (length(from)) strcat("&from=", as.character(from)) else "",
+    if (length(to)) strcat("&to=", as.character(to)) else ""
+  )
   resp <- ncurl(url,
                 convert = FALSE,
                 follow = TRUE,
@@ -759,7 +760,7 @@ oanda_studio <- function(instrument = "USD_JPY",
                   type = input$type)
     })
 
-    output$savedata <- downloadHandler(filename = function() paste0(input$instrument, "_", input$granularity, "_", input$price, ".rda"),
+    output$savedata <- downloadHandler(filename = function() sprintf("%s_%s_%s.rda", input$instrument, input$granularity, input$price),
                                        content = function(file) archive(pdata(), file))
 
     session$onSessionEnded(stopApp)
@@ -1007,9 +1008,9 @@ oanda_positions <- function(instrument, time, server, apikey) {
   server <- if (missing(server)) do_[["getServer"]]() else match.arg(server, c("practice", "live"))
   if (missing(apikey)) apikey <- do_[["getKey"]](server = server)
 
-  url <- paste0("https://api-fx", switch(server, practice = "practice", live = "trade"),
-                ".oanda.com/v3/instruments/", instrument, "/positionBook",
-                if (!missing(time)) paste0("?time=", unclass(as.POSIXct(time))))
+  url <- sprintf("https://api-fx%s.oanda.com/v3/instruments/%s/positionBook%s",
+                 switch(server, practice = "practice", live = "trade"), instrument,
+                 if (missing(time)) "" else sprintf("?time=%.f", unclass(as.POSIXct(time))))
   resp <- ncurl(url, convert = FALSE, follow = TRUE,
                 headers = c(Authorization = strcat("Bearer ", apikey),
                             `Accept-Datetime-Format` = "UNIX", `User-Agent` = .user_agent))
@@ -1099,9 +1100,9 @@ oanda_orders <- function(instrument, time, server, apikey) {
   server <- if (missing(server)) do_[["getServer"]]() else match.arg(server, c("practice", "live"))
   if (missing(apikey)) apikey <- do_[["getKey"]](server = server)
 
-  url <- paste0("https://api-fx", switch(server, practice = "practice", live = "trade"),
-                ".oanda.com/v3/instruments/", instrument, "/orderBook",
-                if (!missing(time)) paste0("?time=", unclass(as.POSIXct(time))))
+  url <- sprintf("https://api-fx%s.oanda.com/v3/instruments/%s/orderBook%s",
+                 switch(server, practice = "practice", live = "trade"), instrument,
+                 if (missing(time)) "" else sprintf("?time=%.f", unclass(as.POSIXct(time))))
   resp <- ncurl(url, convert = FALSE, follow = TRUE,
                 headers = c(Authorization = strcat("Bearer ", apikey),
                             `Accept-Datetime-Format` = "UNIX", `User-Agent` = .user_agent))