The api doesnt look like it supports details of payment info in templates.
To add payment info to PDF I did this manually in the template lie this;
added this below ;
#Payment method
$pdf->SetFont('helvetica','',;
$pdf-> MultiCell(170,6,$_LANG["invoicesnotes"].":
Bank Name: xxx
Payee Name: xxxx
Sort Code: xxx
Account Number: xxxx", 0,'L');
$pdf->Ln();