message: Initial commit for sign/verify with payment address in VCX
diff: @@ -107,6 +107,17 @@ pub extern fn vcx_wallet_create_payment_address(command_handle: u32,
  }
  +#[no_mangle]
  +pub extern fn vcx_sign_with_payment_address(command_handle: u32,
  + payment_address: *const c_char,
  + message_raw: *const u8,
  + message_len: u32,
  + cb: Option<extern fn(xcommand_handle: u32, err: u32,
  + signed_message: *const c_char)>) -> u32 {
  +
  +}
  +
  +
  /// Adds a record to the wallet
  /// Assumes there is an open wallet.
  /// #Params
  