How to use

stringOrNull

method

in

com.ning.billing.recurly.model.AccountAcquisition

public void setCurrency(final Object currency) {
  this.currency = stringOrNull(currency);
}

public void setCampaign(final Object campaign) {
  this.campaign = stringOrNull(campaign);
}

public void setSubchannel(final Object subchannel) {
  this.subchannel = stringOrNull(subchannel);
}