learndash_purchase_invoice_styles
Filter Hook: Filters whether to include purchase_invoice CSS styles in purchase_invoice content or not.
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includes/ld-convert-post-pdf.php
learndash_purchase_invoice_query_string_params_allowed
Filter Hook: Filter for allowed PDF purchase_invoice parameters.
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learndash_certificate_immage_type
Filter Hook: Filters the type of the image to use for the certificate PDF background.
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