PayShield is the most powerful way to have access to your PayPal account. It is based on the PayPal API Credentials and it is available worldwide.
With PayShield you can easily check your online balance, get transaction details, refund a transaction, send money to anyone with an email address and much more.
Key features are:
Complete Balance information (also on multiple currencies)
Advanced search for all the past transactions
Complete transaction details
Send money to anyone with an email address
Password protect access to your data
In order to obtain your PayPal API Credentials just log into your PayPal account and then goto:
Request API Credentials.
PayShield requires a Business or Premiere PayPal account (if you have a personal account it can be upgraded for free to a Premiere one).
*** ABOUT THE SECURITY HEADER NOT VALID ERROR ***
The error is due to the fact that you entered the wrong information into the username/password or signature field.
The problem is probably the signature field... PayPal is not too smart in computing the signature ;-) so most of the time what it seems an uppercase I (i) is really a lowercase l (L). Just try the difference combination of L and I and everything will work fine.
In case you want to try another set of API Signature, revoke the one just created and request other API Credentials from PayPal in the hope that the signature field will contain characters with less troubles.
*** iPHONE OS 3.0 ***
With iPhone OS 3.0 use copy and paste from the PayPal website in order to enter your API credentials!!!