OANDA removed API access to download FX rates

[wthielen]

getFX is not working anymore: it returns a 404 in open.connection.

I checked out the OANDA URL it composes in getSymbols.oanda, and it seems that that URL indeed gives a 404.

The browser-accessible historical rates URL is here: https://www.oanda.com/fx-for-business/historical-rates
The CSV download option seems to be enabled only for Pro users, which requires a $75 monthly membership.

Alternative is to use the Yahoo source:

USDJPY = getSymbols("USDJPY=X", src="yahoo", auto.assign = FALSE)

works OK, but I see discrepancies in the monthly results:

         USDJPY.Close
Jan 2018      108.732
Feb 2018      107.426
Mar 2018      106.479

while I have registered them in my sheet (using the getFX function when OANDA was still working) as:

2018 | 1 | 108.958
2018 | 2 | 106.986
2018 | 3 | 106.235

[wthielen]

Also would probably need to update getSymbols.yahoo to not add the Volume and Adjusted columns as they don't make sense for currency rates.

[joshuaulrich]

Closing as a duplicate of #225.