My PD1 Certification got expired today morning. I forget to wrote the maintenance exam. Is their any possibility to write maintenance exam and retain the PD1 Certification. Or I have to wrote PD1 Certification exam once again to get it. Please help me on this.
When your certification is expired you have to give certification exam again by paying full exam fee i.e $200.
For more information about certification expiration read this: https://trailhead.salesforce.com/help?article=Information-about-Certification-Expiration