Thanks guys. I had planned to get a credential in Spain, but may go ahead and see if my priest can stamp one here.
I did write up something and just wanted to share it incase anyone else has the same issue in the future.
Letter of introduction
"To whom it may concern:
Please allow me to introduce the bearers of this letter, xxx. xxx are members of my parish, yyy in xxx in abc country. Our parish is the zzz Archdiocese.
I present them to you as Pilgrims seriously intent on traveling to Santiago de Compostela. Their pilgrimage is one for religious reasons. I hope that you will extend to them all the privileges given to such pilgrims and assist them in obtaining a credential and ultimately a compostela.
This family has prepared both physically and spiritually for this endeavor. It is my sincere hope that through your contact with xxx, you will be able to sense their true desire to gain spiritually from this pilgrimage and the prayers of our parish that accompany them. As our representatives, we expect that they will conduct themselves in a manner that will reflect positively on our parish.
I truly appreciate your co-operation on behalf of xxx.
All the best,
Father yyy"
Rambler