message: remove unneeded lifetimes
diff: @@ -44,7 +44,7 @@ pub struct Headers {
  }
  impl Headers {
  - pub fn to_array<'a>(&'a self) -> [(&'a str, Option<&'a str>); 4] {
  + pub fn to_array(&self) -> [(&str, Option<&str>); 4] {
  [
  ("Client-Id", self.client_id.as_deref()),
  ("Stripe-Account", self.stripe_account.as_deref()),
  