Developers can customise the behaviour of the plugin through filter hooks. There are many useful filter hooks supported by this plugin, and Gravity Forms has many filter hooks too.

• gf_windcave_invoice_ref

  • string $invoice_ref
  • array $form
  • array $entry
  • return: string

  Change the invoice reference.

• gf_windcave_invoice_trans_number

  • string $transaction_id
  • array $form
  • array $entry
  • return: string

  Change the the invoice transaction reference; NB: must be unique for the PxPay account!

• gf_windcave_invoice_txndata1

  • string $data
  • array $form
  • array $entry
  • return: string

  Change the transaction custom data element 1.

• gf_windcave_invoice_txndata2

  • string $data
  • array $form
  • array $entry
  • return: string

  Change the transaction custom data element 2.

• gf_windcave_invoice_txndata3

  • string $data
  • array $form
  • array $entry
  • return: string

  Change the transaction custom data element 3.