I don't know about Petrer specifically, but I also read the article below from The Local.
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Kind regards,
Kim
"We don’t have information yet on how the people will be called up to be vaccinated, but it will be organised by the regional health authority where you live.
"Those living in Spain have been advised to contact their local health centre to register, regardless of whether they are entitled to free health care or have private health insurance. Tourists and holiday home owners will not be eligible.
"Before you do just drop in, it is advised to call ahead as some health care centres require an appointment.
"You should provide the following information:
Your passport (bring a copy just in case)Your residence card (green certificate or TIE)“Certificado de empadronamiento” (registration with the Town Hall), no older than three months.In the case of minors, you should bring their documents and birth certificates as well. Children do not need to be present.
"Keep checking the health authority announcements online in the region where you are living as each regional government will be responsible for administering the programme in their community. You can do so my clicking on this interactive map for information in each of Spain's autonomous regions:
https://www.mscbs.gob.es/organizacion/ccaa/directorio/home.htm "