Donate checkout

Log error details: invalid_format | Unable to proceed to checkout. Invalid format(s): particular_price_1 field is required. | n/a
CURL action:
POST https://secured.ubiz.unionbank.com.ph/v1/checkouts.json in 0.778557 secs. 400 - particular_name_1=ACN Philippines Donation&particular_price_1=&particular_quantity_1=1&particular_code_1=ACNPFI&custom_title=&billing_first_name=&billing_last_name=&billing_email=&billing_contact_no=&billing_address_1=&billing_address_2=&billing_city_municipality=&billing_state_province=&billing_zip_code=&billing_country=&custom_birthday=&billing_organization=&custom_newsletter=&custom_label_replace_checkout_order_summary=Donation Summary&custom_label_replace_checkout_billing=Donor Information&custom_label_replace_checkout_pay_button=Donate Now&custom_label_replace_checkout_order_total=Total&custom_label_replace_email_order_information=Donor Information&custom_label_replace_email_seller_information=Campaign information;
CURL raw result:
{"meta":{"response_code":"400","error_type":"invalid_format","error_detail":"Unable to proceed to checkout. Invalid format(s): particular_price_1 field is required.","error_code":"n\/a"},"response":[]}