WooCommerce + NeutronEDI

<?php
/**
 * Plugin Name: NeutronEDI Inbound 850
 */

add_action(
    'rest_api_init',
    function () {
        register_rest_route(
            'neutronedi/v1',
            '/inbound',
            array(
                'methods'             => 'POST',
                'callback'            => 'neutronedi_handle_inbound',
                'permission_callback' => 'neutronedi_check_secret',
            )
        );
    }
);

function neutronedi_check_secret( WP_REST_Request $request ): bool {
    return hash_equals(
        getenv( 'NEUTRON_INBOUND_SECRET' ) ?: '',
        $request->get_header( 'x-inbound-secret' ) ?: ''
    );
}

function neutronedi_handle_inbound( WP_REST_Request $request ) {
    $raw_edi = $request->get_body();

    $resp = wp_remote_post(
        'https://api.neutronedi.com/api/v1/read/x12',
        array(
            'headers' => array(
                'X-API-Key'    => getenv( 'NEUTRON_API_KEY' ),
                'Content-Type' => 'application/edi-x12',
            ),
            'body'    => $raw_edi,
            'timeout' => 15,
        )
    );

    if ( is_wp_error( $resp ) ) {
        return new WP_Error( 'neutron_read_failed', $resp->get_error_message(), array( 'status' => 502 ) );
    }

    $parsed       = json_decode( wp_remote_retrieve_body( $resp ), true );
    $created_ids  = array();

    foreach ( $parsed['transactions'] as $txn ) {
        if ( '850' !== $txn['type'] ) {
            continue;
        }

        $order = wc_create_order(
            array(
                'status'         => 'processing',
                'customer_note'  => 'EDI 850 ' . $txn['poNumber'],
            )
        );

        foreach ( $txn['items'] as $item ) {
            $product = wc_get_product( wc_get_product_id_by_sku( $item['sku'] ) );
            if ( $product ) {
                $order->add_product( $product, $item['qty'] );
            }
        }

        $order->update_meta_data( '_edi_po_number', $txn['poNumber'] );
        $order->calculate_totals();
        $order->save();
        $created_ids[] = $order->get_id();
    }

    return array( 'created' => $created_ids );
}

{
  "interchange": { "sender": "REGIONALRETAIL", "receiver": "INDIEBRAND", "control": "000001401" },
  "transactions": [
    {
      "type": "850",
      "name": "Purchase Order",
      "poNumber": "RR-44512",
      "date": "2026-04-25",
      "items": [
        { "sku": "MUG-CERAMIC-12OZ", "qty": 48, "unitPrice": "5.50" },
        { "sku": "MUG-CERAMIC-16OZ", "qty": 24, "unitPrice": "6.50" }
      ],
      "total": "420.00"
    }
  ]
}