You have to unprotect meta to be able to access it with XML-RPC:
<?php
function my_unprotect_meta( $protected, $meta_key, $meta_type ) {
if( '_al_listing_price' == $meta_key ) {
return false;
}
}
add_filter( 'is_protected_meta', 'my_unprotect_meta', 10, 3 );
The solution you’ve mentioned in the comment to the question is ‘duct tape’ though it works. It completely removes meta value sanitization, which is the bad idea.
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